Yes even I dare say that they will come back out as champions. Indeed I have not seen what their gameplay is like for next season, but I'm sure they will do more or less the same as the previous season. If you look at the team squad, Bayern Munich is quite promising with the arrival of their new player. On the other hand, Borussia Dortmund, which is expected to be their competitor next season, has lost their good striker.
In the Bundesliga, it's clear that next season Bayern Munich will still be champions because considering, as you said, the current Bayern Munich squad is very complete and it definitely gives Bayern Munich more power next season so that Bayern Munich's chances of winning are again in the Bundesliga is still bigger.