Well the way I see it, the biggest prize in club football (in Europe for sure but really in the world) is the Champions League, Messi wants to win it again before he retires. Barcelona are not gonna win it in the next few years, they are gonna try and rebuild a new team with a solid base that can build up to that of course, but realistically it's probably out of sight. Messi has the choice of being there for that rebuilding project while knowing he can't be part of the long-term plan.... or he could move aside and let them do that while he gets paid billions to have one last crack at the big time with City or PSG or whoever. I can see the logic of that, although of course it will be difficult to leave the club where he spent his whole career and so on.