~
Sacking Ten Hag won't change anything but rather would even cause more problems for the team cause the new coach might even find it more difficult to work under the glaziers that are only interested in the financial benefits they're getting from the club instead of making investments to help it grow.
No one can know this for sure. Maybe the new coach really won’t be able to change much since Ten Hag has already made mistakes that are difficult to correct - for example, buying Onana is definitely a mistake. For the new coach to be able to fix anything, he must take part in at least one transfer cycle, and given the fact that United has already spent a lot at Ten Hag’s request, new serious acquisitions will have to wait at least until the summer.