Forget that. Badstuber ist still trying to make his comeback. Yes, healthy and fit he would be Pep's dreamsigning - but he still works on a stable comeback that he might never make. He is a very big questionmark. He is absolutely world class in passing and positioning - and is tactically very intelligent.
Badstuber is why Demichelis left Bayern. A 20-year-old then that perfectly fit van-Gaals (and Pep's) dream of a left-footed build-up player with fantastic passing skills. Prior to his first ACL in 2012 he was first in the pecking order of the German young defenders - ahead of Hummels and Boateng. But then he had his first ACL - then his second. He came back in Pep's second year, started some matches - then was injured. Came back for the middle of the season and had a longer row of matches - until he had a real big muscle injury in the second match against Porto. Came back last season again - and when he had started to play a couple of matches in a row he broke his ankle.
The problem at Bayern is not to get a new contract - Rummenigge already promised him that. Bayern is very special in giving contracts to players with an injury record - they do not think economically in this especially as Hoeneß is back on the reign. Once family always family.
I could imagine him going to one of the smaller Bundesliga clubs around on loan to get match practice. I think that it is right now about making the last try to get this career running again - if not I think he might quit early and go into coaching.