imo, you guys are holding onto players for too long. its not good to sell without (better or equally good) replacements most of the time, but sometimes it is better to just let go. some players decline rapidly out of the blue, and if you miss your chance to replace them adequately, your squad declines. this is the case with Bayern right now, Lahm, Schweinsteiger, Robbery, all played or still play until they wont be able to move anymore or retire. Muller declined but is still a key player etc.
my point, a good GM knows the right moment to cash in on a player and get a good enough replacement, keeping the squad fresh and competitive. Bayern hasnt done that lastcouple of years