Littlefinger's downfall was his love of Stark women, gave Sansa leverage when she lied for him about her aunt's death and the Vale dudes were dead set on killing him. He also sold her to the Boltons' which turned her away from him when she came to see her and admitted that his life was in her hands. He is smart but made miscalculations along the way which left him pledged to the Starks and they had a hold on him. I think the Vale people never liked him anyway. A lot of the players have gone and it's now down to Dany vs Cersei with not many allies left, LF did not have room to maneuver in that new reality.
OFFICIAL Game of Thrones Season 7 Thread - Winds of Winter. Spoilers=BAN, Theories in [spoiler] tags
altruicsense
Lord of the 7 Kingdoms
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Kunty McPhuck
Scust Szn has Returned
GOT to keep making that dough
BLΔCK⁂W⊙LF
All Star
It was only a small contingent of them, and any competent King would have already taken them out long before heading to Winterfell. If he were smart, Jon would have died at the Battle of the b*stards, and Littlefinger would just kill Ramsey Bolton bringing Winterfell under his rule. Sansaa would have been relegated to a Lady with no damn power. Sort of like the Queen of England.
Kunty McPhuck
Scust Szn has Returned
Sam: What happened to you beyond the Wall?
Bran: I became the three-eyed Raven.
Sam: Ohhh
I like how no one knows what that shyt is
BRAN: "I'm the three eyed raven"...
Everyone else: .:whatyoumean::cliffordharrisexcuseme:...aight so...:confusedjagfan:...anyways :JordanFunny:
MenacingMonk
Tranquilo
Can't leave the incest thing to one family. 
Not sure if it's been said but I watched it again and I find it fukked up how nobody stepped in front to save cersei from dead dude. They jumped up all late after that dude already got pulled back... I would have fired them all. Lol