Sasha & Bayley are almost definitely walking when their contracts are up, but where would they even go?
they might surprise us, but i think bayley's more likely to walk and choose a different career entirely and fade from our view, whereas sasha seems to be a diehard mark so she'd probably go work indies as a headliner against their various women's champs - normally those championship matches wouldn't be top of the card, but with sasha in one they would easily be top of the card and she'd (correctly) demand the appropriate amount of money. she'd probably come back as a legacy star, too, no matter what.
that's if they don't turn the sasha booking around a bit. she isn't completely ruined, yet, only mostly ruined. sasha's got a certain thing that if they turn her heel and let her go over big in a few matches, she'd easily be bigger than charlotte, despite charlotte being the better wrestler. i want to say they killed her 'the rock of the women' factor already, but you never know. she's smart about her work and deluded enough to be utterly determined. we'll just have to see.
bayley on the other hand will probably just go and start her own private business or something using the funds she accumulated from wwe and have a happy life. that is, unless she decides she wants to try and fix what has happened, but i don't see that in her.