I don't have any issues with Wesley being brought on as a Traveler. He was not my favorite character on TNG for sure, but I like the actor himself, he was great on TBBT and it does ring true as something that could happen in the future for his character's cannon.
I think the show is still finding itself and as long as a few of the main characters remain, it might not be a bad things for a change of some of the characters. The show is called "Picard" so really, that is the only character that needs to remain. If they bring the Wesley character onboard as a traveler we could be looking at many more time travels eps both to the past and the future.