Firstly, you've absolutely noway of knowing Moyes will be fine. In fact, if Moyes is to be fine it's gonna take a massive change in tactics, performance and luck.
Secondly, I don't think anyone thinks Moyes is a bad manager. The fact is he is a good manager. But that's the issue, he's exactly that. The biggest job in British football should not have gone to a good manager. Big Sam is a good manager. Tony Pulis is a good manager. He is out of his depth and he has us sinking, rapidly. The job should have gone to a great manager, a positive tactician with charisma.
Managers who are world class manage top clubs all the time. Madrid only line up world class managers. City and Chelsea go for European standard managers. We haven't and the romanticism has failed to pay dividends.