In my opinion, this is wishful thinking. Half of them are rubbish and always were - Maguire, Lindelof, Dalot, Zirkzee, tbh list is endless. and a few are washed up and well past their prime and not up to PL standards anymore - Casemiro, Eriksen, etc. There's also a bunch who demonstrated talent in the past but are not driven enough anymore and just turned into a permanent lazy looser - Rashford.
Obviously there are some quality players but nowhere near enough to make a solid XI, let alone a solid squad...
The reality is that most players are dogshit and no coach will be able to compete to United standards with this squad. It's simply not possible . Guardiola , Klopp, it doesnt matter, they would all fail coaching these.
All The big 3 in Portugal have better Squad. Even Porto which is substantially worse than the other 2 at the moment.
ETH wasn't The problem and Amorim wont do better if critical signs aren't made or some hidden gems are brewing in the youth teams that can have immediate impact.
We will see though.