If they win the league they'll stick with Kovac imo, they're gonna be basically rebuilding now for the next few seasons. Out with the likes of Robben, Ribery, Lewandowski, Boateng, etc and in with a lot of new faces. Hence why they're so hot on a young lad like Hudson-Odoi. Or their heavy links to Lucas Hernandez from Atletico and Pavard who they seem likely to sign.
Can't see how appointing a near 70 year old would help with the rebuilding process. I think we just have to accept that Wenger's time is done. The time for him to manage the likes of Real, Bayern, etc was a few years ago but he chose to remain at Arsenal.
The big factor with Bayern/Kovac is that Niko is Hoeneß' boy and was his personal choice.
Any other manager would've gotten the boot in December with the squad rebelling against him like they did. But if Bayern had fired him so early, it would've massively fallen back on Hoeneß who had wanted Kovac. So the squad got a bollocking by the hierarchy to stop their diva like moaning and play football again - and that's when their league season started to turn around.
It's why they also started to publicly tread that "transition" period and how big they will spend in the summer to overhaul their squad. Firing Kovac early would taint Hoeneß and that's why it's just not possible for him, so they bring in excuses about transitioning.
I'd guess Kovac will get the sack at the earliest in autumn/winter next season.