if you say now Lewa is a player who is still quite good. even his productivity is still very sharp and no doubt. look at this season he has scored 23 goals and even solidly at the top of the top scorer. this proved that he was indeed very worthy and still strong enough to be defended. It would be a huge loss if Bayer really lost this player because up to now at Bayern there is still no striker who can replace Lewa, I think.
In the end, everything will depend on the financial needs of Lewandowski himself, because the title of the best FIFA player for two years in a row, in theory, allows you to ask for more money under an extended contract. On the one hand, Bayern Munich may not agree to this given the age of the player, on the other hand, I don't think Lewandowski will have any problems finding the club that will agree to pay more. The problem with age is purely physiologically not a problem at all and should not be an insurmountable obstacle at the current level of medicine and the training process. Especially considering the playing role of Lewandowski on the field, who, thanks to his experience, can find the right point to make a striking shot at the goal or create a moment for himself.
in the end there will always be things like this but I still feel this is not a significant obstacle when extending the contract later.
on the other hand I quite agree with what you said even though he will indeed change clubs he will not find it difficult to find a new club that will pay more even though he is not young anymore.
He is one player who is quite good at creating momentum as well as making his own space in the opposition defense and indeed he has something more than some of his other strikers.
actually I still want to see him stay but indeed if later the agreement cannot be reached and has to move to another club then indeed that can be a decision at the end