Robert Lewandowski is of course one of the greatest strikers now. He is getting older but his performance improves more in time. I think that he is better than last season now for example. He can break a new goal record in the Bundesliga if he goes on like that. Bayern Munich are really lucky to have him but he seems likely to leave this summer also I think. Actually it will depend on the offers for him. If he gets a really satisfying offer from another big club, then maybe he would make a change in his life from now on.
Indeed, being one of the best players in the world today makes him attractive to many big teams, such as one of the Spanish giants Real Madrid. He proved it with several well-deserved awards.
You are right, if the offer that came to Lewandowski satisfies him, it looks like he will sign for the team.