[S7E3] Was _________ foreshadowing their own death?

So, in this episode we have a fun scene with Sansa walking around Winterfell taking charge. She looks over her supplies and sends off both the Maester and Ser Perma-Plate to make preparations for the long winter ahead. This leaves Littlefinger with the opportunity to start whispering into Sansa's ear again. He knows his power is waning, his sway over Sansa hasn't seemed to take hold, and he begins to desperately get inside her head. He tells her some mumbo jumbo about not fighting in the North, or in the South, but fight everywhere. Always plan that everyone is your enemy and everyone is your ally and you'll never be taken off guard.

Well, the irony here is that Littlefinger is only taking into account the "real world" threats. It certainly seems like Littlefinger (as most others) don't quite buy into the whole "supernatural forces exist in this world" idea. Littlefinger has always been one of the most grounded in reality characters this show has had. His very character has paved the way for the concept that it's not just the large houses and the great knights that rule the world. He's done so by using practical means the whole way. The very idea that magic exists probably sounds ridiculous. Which is ironic, because it'll likely be the thing that finishes him

Littlefinger can plan, and scheme, and look 360 degrees around him at all times expecting the unexpected. Unless the unexpected is something he possibly can't fathom, like a time-traveling, all-knowing Stark child maybe? The one thing that finishes Littlefinger is the one thing that he couldn't possibly expect. A being with the knowledge and power to reveal all his secrets, all his betrayals. Murdering Jon Arryn, throwing Lysa from the Moondoor, betraying Ned Stark? Littlefinger will no longer be able to conceal any of these things.