Who does Bayern look at if Gnabry leaves? He's seemed pretty underwhelming this season and it feels like there's a fit issue when you consider all of him, Sane, Coman, Muller, Lewy, Musiala, etc..., and as seen in UCL, they're very disjointed when trying to just jam most of them somewhere in the lineup together (e.g. Sane playing out wide though he probably is better centrally, Musiala maybe also better centrally, Gnabry looking ineffective out wide). I know Muller and then Lewy will eventually be moving on but not sure Gnabry (or maybe any of those guys) adequately fill the same type of role--I see more a Wirtz or Burkardt-type pickup for that.
Depends on what happens with Lewandowski to some extent, but with Sane, Musiala, Coman, Müller, & Wanner there already...I'm not sure they go after anyone high profile unless it's a replacement for Lewa.
Especially if they add a dynamic RWB (Mazraoui/Baku) -- like they've been reported to be working on -- and so don't use an extra winger, as often as they have this season. Gravenbech and better availability from Kimmich & Goretzka would already eat into some of the minutes that Musiala & Müller have picked up this season in the midfield.
So they might need those minutes just to keep everyone they've already got happy & in form; especially if they want to increase Wanner's PT & give him a more meaningful role.
E:
I think their issues over the past 1-1.5months have largely been a result of their poor depth in the midfield. Tolisso being always broken & Sabitzer not working out leaves a huge burden on Kimmich & Goretzka; which is a problem if either of them ever misses time...like LeGo regularly does & Joshua's free-thinking-ass did this season...
...and the contractual distractions.
Plus Neuer slowing down and no longer being able to bail them out through any slip-ups, like they're accustomed to him doing, also hasn't helped...