This isnt realistic,Bayern Munich always go for players that will stay in club for 5+ years and they are looking probobly for under 27-28 years old strikers. Ronaldo would be a boost for their marketing and would attract more fans to watch bayern munich but this wont happen because Bayern dosent think he is the future for them.
I agree with you. Commonly, Bayern Munich only signed new players with a long contract duration. And the new players should be below 35 years old. Ronaldo is already 37 years old, it isn't an ideal new player for Bayern Munich. I think Bayern Munich won't choose Ronaldo if there are other realistic options.