How do you think 5D's would have been had Crow (or more precisely, his Blackwing deck) did not blow up in popularity?

Do you think we would have seen the intended 5th Signer Dragon >!Life Stream Dragon!< much sooner?

I also heard that Crow himself was intended to be the 7th Dark Signer, which makes sense because Wiraqocha Rasca is a DARK Winged Beast like the Blackwings, and the archetype can swarm enough bodies to Tribute for the Immortal.

And what other changes would have happened to the plot if Crow/Blackwings did not get as popular as they did?