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Even this all is right, but Bayern Munich is not going to invest in Cristiano Ronaldo as this is not good investment for them, and they will prefer any young player which able to give them results for long time most chances Cristiano Ronaldo will be also not available for them in coming season as well or in winter transfer window because now things are improving in Manchester United as well, and they are improving performance which is good signal for them.
Even right now Bayern Munich is looking for attacking striker but surely their preference could be different from your all statement, and they are not luxurious club like PSG which invested big amount on stars and having results their history is completely different, and they can do much better with young players which is easy and good for them.
You analysed it very well mate. The chances that Ronaldo will go to Bayern is very small and if he eventually goes, it will not be a good business for Bayern because of the age of Ronaldo. Bayern Munich doesn't need anyone to give them one season backup. They need a longer term striker which will be a younger player than Ronaldo.
The problem is that i don't see any good young striker available in the market. Strikers are scarce these days in football.
Ronaldo may not want to leave Manchester united in January open window because the club would be better by then.