Doran Martell: "Where is my Son? (Spoilers Extended)

The long and complicated history of Dorne and the IT/dragons/Targaryens/Blackfyres is too ponderous to full give background on here, but Dorne certainly seems to limited to team fAegon:

Fire and blood was what Jon Connington (if indeed it was him) was offering as well. Or was it? "He comes with sellswords, but no dragons," Prince Doran had told her, the night the raven came. "The Golden Company is the best and largest of the free companies, but ten thousand mercenaries cannot hope to win the Seven Kingdoms. Elia's son... I would weep for joy if some part of my sister had survived, but what proof do we have that this is Aegon?" His voice broke when he said that. "Where are the dragons?" he asked. "Where is Daenerys?" and Arianne knew that he was really saying, "Where is my son?" -TWOW, Arianne I

Just some thoughts on how I think Dorne is going to "respond" to Quentyn's death

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This event that provokes a reaction is certainly Quentyn's death:

What's happened is, I've decided to move two completed chapters, from Arianne's POV, out of the present volume and into THE WINDS OF WINTER. This is something I've gone back and forth on. Arianne wasn't originally supposed to have any viewpoint chapters in DANCE at all, but there's this... hmmm, how vague do I want be? VERY vague, I think... there's this event that would of necessity provoke a Dornish reaction. The event was originally going to occur near the end of the book, but in one of my forty-seven restructures I moved it to the late middle instead. And the timeline then required that the Dornish reaction happen in this book and not the next one, so I wrote the two Arianne chapters and was going to write a third... and a chapter from another POV that would be a necessary complement to them, and...

But no, I've restructured again, and put the original precipitating event back close to the end of the book. Which means the Arianne chapters can be returned to WINDS, where I had 'em originally. It also means that I don't have to write that third Arianne chapter and the complementary chapter from the other POV... not yet, anyway... which moves DANCE two chapters closer to completion. (The move did mean I had to revise two chapters from another POV, which took place after the event in last week's draft, but now take place before said event, but fortunately that was just a matter of tweaking a couple of lines). -SSM, Dancing in Circles: 27 June 2010

As it happens at the toward the end of ADWD (Chapter 68):

When he raised his whip, he saw that the lash was burning. His hand as well. All of him, all of him was burning.

Oh, he thought. Then he began to scream. -ADWD, The Dragontamer

and then Barristan (Chapter 70):

"Whitebeard." Belwas smiled. "Where is liver and onions? Strong Belwas is not so strong as before, he must eat, get big again. They made Strong Belwas sick. Someone must die."

Someone will. Many someones, like as not. "Sit, my friend." When Belwas sat and crossed his arms, Ser Barristan went on. "Quentyn Martell died this morning, just before the dawn."

The Widower laughed. "The dragonrider." -ADWD, The Queen's Hand

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As we see from the TWOW, Arianne chapters, Doran is going to remain cautious, but due to process of elimination:

• Lannisters/Tyrells (Revenge for Elia/Rhaenys/Oberyn/rAegon)

• Dany ("killed" Quentyn, reinvigorates Dorne's memories of dragons)

The most beautiful woman in the world, thought Quentyn. My bride-to-be, if the gods are good. Sometimes at night he lay awake imagining her face and form, and wondering why such a woman would ever want to marry him, of all the princes in the world. I am Dorne, he told himself. She will want Dorne. -ADWD, The Merchant's Man

and:

Dorne was a blighted, burning ruin by this time, and still the Dornish hid and fought from the shadows, refusing to surrender. -TWOIAF, Dorne: Dorne Against the Dragons

• fAegon

• Stannis/non Bolton North (possible but kinda fruitless)

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So while I don't want to speculate too much on Arianne marrying fAegon (which is a problem in itself, because the Golden Company/Jon Connington want fAegon free to marry Dany).

But even if (sorry I am speculating) Arianne marries someone else on fAegon's side that still doesn't mean that Dorne is now on Daenerys' side as well. We currently have two sand snakes en route to King's Landing and I would expect stuff like this to start to happen:

The Dornish responded in kind, and many were the pitiless deaths that followed. Even in the heart of King's Landing, no one was safe. Lord Fell was smothered in a brothel, and King Aegon himself was attacked on three separate occasions. When Queen Visenya and an escort were set upon, two of her guards died before she cut down the last villain herself with Dark Sister. Worse occurred at the hands of the Wyl of Wyl, whose deeds we need not recount; they are infamous enough and still remembered, especially in Fawnton and Old Oak. -TWOIAF: Dorne: Dorne Against the Dragons

Not saying its a 1:1 comparison, just pointing out how the Dornish will tend to fight back.

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I don't think it necessarily matters that Dany didn't kill Quentyn herself. Its the rejection of the marriage proposal (rejection of Dorne) and then the reignition of the Dornish memories of dragons.

Even as she embraces her Fire & Blood mantra, like Robb Stark she can realize that everything can become super complicated even if you win all the battles.

Could she later conquer Dorne? Sure. But the current political climate prevents true Dornish/Daenerys alliance.

TLDR: Just some thoughts on why Dorne was a possible future ally that Dany lost