maybe he can only contribute 1 or 2 seasons for Bayern Munich considering his age is 38 but Ronaldo still has a very good physical and game even though he is old, and yes it is true Ronaldo will be able to contribute a lot to help Bayern Munich win the Champions League, if this transfer is realized then Bayern Munich will get a very decent replacement for Lewandowski
I don't think he will go to Bayern next season especially if we look at the current management of Bayern still prioritizing Lewandowski and providing regular guarantees for Mane next season so even if Ronaldo wants to go there there is no guarantee he will play as a priority.
This is clearly not what Ronaldo wants in my opinion, especially in this case Ronaldo wants to change clubs just to play in a better competition than Manchester United now. when there are no guarantees there I don't think Ronaldo will either.