Kyle Walker will turn 34 in May, so it may be important for him to adapt to the relatively easier competition compared to the Premier League. The Bundesliga is not as strict as the Premier League, so it might be good as one of Kyle Walker's considerations for the upcoming season.
Kyle Walker is still very fast for a right-back, but as he gets older his performance and speed will certainly decrease. I still think Kyle Walker could play for Manchester City for the next few seasons, but I don't think it will be more than 2 seasons. Pep Guardiola must convince Walker to stay until he at least finds a suitable replacement for him.
Kyle Walker is one of the few right-back that would be able to compete with 50/50 speed with attackers. However he's getting weak but that doesn't mean he's a flop, he gaining every strength and experience. Bayern Munich interested in the English right-back, his chances of moving to the bundesliga side is 80%. Afterall he declined in performance and not consistent in league games for Manchester City, frequently recording severe injuries that would hindered him from giving his 100% energy for league games. Pep Guardiola is an ambitious coach, who wants his result to be winning at all course, no time for reluctance attitudes, ready to take on his opponents in league games.