We can't guarantee trophies. The next manager has to set the foundations of a modern play style. I thought that was the least Ten Hag would be able to do, evidently not.
We don't need a top manager to do this, we just need a competent coach. We don't need Inzaghi or Nagelsmann or Amorim (although the latter two would be great). An Iraola, Hoeness even a Gary O Neil or a Thomas Frank would genuinely improve us right now. When we hit the ceiling with that coach - move on. And keep doing that till we win big trophies. It's really not as complicated as it seems.