I don't think that Lewandoski will be replaced by Ronaldo, Ronaldo is too old and can't guarantee any kind of future for a team like Bayern, that's why they has bought Mane, at the moment I've starting to understand why
of this move, he will be the future of this team probably, but they also need anyway to enforce his attack, Lewandoski is an outsider and it wouldn't be so easy to replace it.
They have to replace the player, but usually they only have to replace the goals he scored each season. That was +40 goals with all the games. If they can do that with 2 players, then they have reached the goal. I'm glad that is finally done, again and again because of one person. Now at Bayern 2 great players should take over his part and they are also so successful.