I doubt Adult Scott is coming back. That's probably a picture of Teen Scott grown up. And even if it was Adult Scott, I don't think that would be an issue.
1) Scott is not well-liked by the X-Men. Jean is. The X-Men will pick Jean over Scott any day of the week.
2) It would be the stupidest thing for Marvel to put Scott and Jean back together. It doesn't respect continuity. It's been repeated several times that Jean was a teenage puppy love mistake and Emma was the love of Scott's life. Jean is still the woman that Scott fell out of love with and Scott is not the same man that Jean fell in love with. It doesn't make sense in-story. It also doesn't make sense out-of-story for Marvel as a business. Fans don't want Jott. They want Scemma. From a psychological perspective, that makes sense because of the way our brains internalize and remember events. People judge experiences according to their "peak" (most intense point) and end (
Kahneman/Tsversky). Also, the further the "peak" point is in the past, the more the end will matter. If the event has a negative peak and end, then no matter if the majority of the experience was moderately positive, people will still consider it a bad experience. Jott's "peak" was also its end - the affair, her death and that vomit-inducing Scemma kiss over her grave - and it was extremely negative for the couple. On the other hand, Scemma ended with a whimper, not a bang with an acknowledgement of Phoenixclops that Emma was everything he needed while Jean was not. The end was therefore not very memorable and actually slightly positive. Its peak was probably Whedon's Astonishing so fans generally have a positive view of the pairing. So in conclusion, it makes sense for Marvel to have Scott back with Emma rather than Jean.
Wolverine won't be an issue. He'd be more than happy to have Jean in a leadership position.
Emma doesn't have ideals. She's fighting for Cyclops' ideals and is still fighting for Cyclops' ideals. They were never hers. She wanted to leave during Schism but stayed because she loved Scott. She wanted to leave again after busting out of prison but had nowhere to go and was still in love with Scott. Secondly, the Emma/Jean rivalry has never been about different ideals. It's always been about Emma's Jean Grey issues/inferiority complex. Jean wouldn't think twice about Emma if she hadn't been a homewrecker for shits and giggles.