Yes, I'm also interested in what Ten Hag can do, but judging by the bookmakers' odds, he won't have much space to prove himself:
Fc Bayern Munich - 1.30
Bayer 04 Leverkusen - 8.00
Borussia Dortmund - 11.00
Rb Leipzig - 17.00
In fact, in order not to fail, Ten Hag only needs to win the race for second place against Dortmund (which does not look like a big task) and even if he loses it, it is unlikely to matter, since any place after first is assessed only as whether it gives a ticket to the Champions League or not.
As for the Champions League, there is also a fairly simple task - to get into the top 24, and then hope for a successful draw.
Well the bookmakers did not accurately predict that Bayer Leverkusen would win the Bundesliga title without losing a single game

There is always room for some surprises, but the odds to have one team beat Bayern next season are indeed very low. I don't think ten Hag is expected to win the title, but I am at least hoping for some serious competition. Leverkusen lost a couple of important players and I still think ten Hag is not the coach they should have brought to Leverkusen.