I never doubt the quality of Kyle Walker, but I don't think Bayern Munich will sign him. If they transfer, it would be a good challenge for Walker, of course. I think he will go to Saudi Arabia to earn money because a 33-year-old football player will want to earn serious money in his last days.
At that age it's time to think about money over career and I think that's also a very natural thing for him, but if there is still an option for a better team in a more popular league I don't think Kyle Walker would be wrong to go there either. But in this case I agree more that Kyle Walker wants to consider more money than continuing his career which will eventually be released by the team that signed him at that age.