He was - and is - clueless at coaching good players.
I'm not saying he could have done it but I think Ferguson thought
Moyes could mitigate a quick decline after his departure because of how he operated, day-to-day. Not sure his time there was a fair litmus test and they haven't fared any better since but them's the breaks in the "big time". The majority of Mourinho's time has been spent working with a lot of talent and, for the most part, he's been successful at it. Not there, though...
They would have been fine if they stayed with Moyes. Still stuck with RS disease, we have a right to win trophies. You don't and you won't until you get rid of the attitude.
They love the limelight until it goes tits up...now it's the fans, former players in the media and the media itself trying to uphold them to a standard they can't sustain because it was primarily being generated by Ferguson. If it wasn't, we wouldn't be having this conversation and they'd still be rolling on.
Thirteen league titles in 26 years...7 in the previous 115 years before his arrival. They need to wake up; those days are gone and they're not coming back...well over a century of football league results proves it.
I'll just sit back and watch them all throw a tantrum...light entertainment.