That's the expectation that all the management and the fans have. All the new coaches can't guarantee he'll be good. We can only see how history he has made. So I think whoever Bayern Munich coach has the same expectations, there will definitely be pressure for a new coach. If it fails then actually Munich have set an example for Tuchel, they can immediately change another new coach. As a new coach I don't see him badly. He has a wide and long range, he can lift Barcelona to the better and I think people have understood.
Don't be a hurry to place offers for Xabi Alonso because alot of things will go wrong, he has not proven to be promising. Bayer Leverkusen is the best club inform in the Bundesliga season. They're unbeaten and ranking first on the table, they're bringing the title home this season. Bayern Munich management targets to bring Xabi Alonso to the club but I don't think it's a wise decision because this is the only prominent season for Xabi Alonso to shine, after this one, check him out next season and watch how everything will play out.
But he is also a tactically effective coach. You think it's still early, and maybe you're right. However, considering that he intervenes according to the course of the game, I think he can be more successful at Bayern Munich as a coach with potential. So I think if Bayern can get him in charge, I think we can see more successful seasons.