Ronaldo can be a solution for Munich for the front lines. but it all depends on the interest and seriousness of Munich.
if consider the purchase to be a Munich business and long-term investment. Of course, Ronaldo will not be on the Munich buy list. with old age, although the arrival of Ronaldo will make sales of jerseys and souvenirs from the club increase. but it will only last for the duration of the contract. I think Munich is thinking of a player asset that has more value in the long term.
Ronaldo is not a player to rely on now, he is not very active in performance like before because of age. Bayern Munich needs a kind of player that is young and talented. Let's take a look at Ronaldo in Manchester United, he is not the main strength of Manchester United. The only advantage of Bayern Munich signing Ronaldo is that they will generate more money from the sale of jerseys. Signing Ronaldo will also require lots of money for Bayern Munich.