Yes, rumours are rumours. But it's this thing about him wanting CL. I really don't understand it. If it really is this important, would he even consider leaving Europe (for MLS)? The problem is that there aren't that many realistic CL winners that would want him.
Bayern Munich (maybe if Lewandowski leaves, Ancelotti likes Ibrahimovic, but still not likely)
Real Madrid (maybe if Benzema leaves, but they don't buy old players and Ronaldo would probably not want him to come)
Juventus (if Higuain goes elsewhere and Allegri stays, not sure if they have 'forgiven' him for leaving them after Calciopoli)
Atletico Madrid (if Griezmann leaves, but the problem is their style of play, maybe if Simeone leaves as well?)
Dortmund (if Aubameyang leaves, same as for Atletico Madrid)
So what other teams are there out there that can win the CL in the next 2 years? Not that many and those I mentioned will never buy him, mostly because they don't need him.
This is why I don't believe this CL rumour. He'll either stay no matter what position (if the club wants him) or he'll return to whatever club in Italy that wants him if he wants to stay in Europe. But he won't care about the CL.