On the one hand, it was a very good decision because he was not able to play well when he was the coach of Leverkusen. Now maybe he will try to improve himself to some extent and by then he can find a good coach. If Leverkusen is transferred to this coach again, it will be foolish because it may lead to a weak coach, but they will have some new experience and a means to improve the players with some good performance. That is why they have no other choice. If they lose, they will still have to pay the money and if they win, they will also strengthen themselves by paying the money, which is a good decision for them.
Firing ten Hag is a good decision for Leverkusen management. Still , Leverkusen face some financial losses. They should have been more careful before hiring a coach. Ten hag has little experience. He was a complete failure with Manchester united. Still, Leverkusen management took the risk of making ten hag the manager. And with the new manager, we have seen Leverkusen's inconsistent and poor performance.
There are rumors that Kasper Hjulmand will be the new coach of Leverkusen. But I don't know if this is true. Kasper Hjulmand is not very experienced, but I have seen Denmark perform quite well with Kasper Hjulmand. At least Hjulmand can do a better job than Ten Hag, that's my belief.