In X-men blue Bunn has been playing with the idea that these teens definitely have to go back to their time. but marvel has played with the same idea before and always backs off, the diference is that this time they are making an event based on this idea, if it's something big it could mean that they are really doing it this time.
Bunn also mentioned that he did not know about Extermination when blue started (blue original plans could be unrelated to extermination) but he also said that he had to change his plans because of the event.
What do you think will happen with them? are they going to their time or it's just another tease?