There are reports going around that Thomas Muller is considering putting in a transfer request when the season is over so that he could leave the Allianz arena the next coming summer. Seems that he is trying to find new competition since it's almost the same way when it comes to the Bundesliga.
Well actually he it seems like he (Thomas Müller) is unhappy with his role in the team and the Niko Kovac (coach).
Last weekend it was the 5th match in a row where he wasn´t in the starting XI and the coach said "If there is an urgency, he will get his minutes" (not exactly what a well deserved player wants to hear).
Either way he´s 30 years old now, never had have an other professional team than Bayern, so 2020 is the last chance for him to sign a last big deal + Bayern can ask for a transfer-fee (contract ends in summer 2021).
I have never been a big fan of Muller though, I think it's high time he leaves Bayern he's obviously no longer as indispensable like once was. However, I'm not sure any big club would be to splash a big transfer fee to sign him.
Don´t get me wrong, I am the first looking for Bayern to struggle all campaign long, just wanted to provide some stats, not crashing the party 
It's not about crashing the party, all you've highlighted are just facts! We've seen it year in year out. To contest against Bayern for the title will always require more than just performing well for 8 weeks or even mid season. You've got to bet on your toes for the whole of the season, you can't afford to lose momentum.