I think you missed the irony! The irony being we could have done with a player like Matic more so than Mata and yet we funded such a player going to Chelsea.
Other than that you are spot on! Mourinho was always the only manager we should have looked to have got. 10+ years of further success, another decade and instead what next. The sad thing about the Moyes situation is who else would you actually get?
Guardiola who has really only proven himself at two clubs with an embarrassment of riches and quality. He might command initial respect, but would he really seem to great without having a great team to start off with. For this reason I would also be surprised if he was even interested in the job. I think he'll always be a manager who goes straight to great established teams, as opposed to a team requiring substantial work.
Simeone, but would he come to the Premiership? Seems to be doing great results with Athletico Madrid, but again the Spanish league is very different to the Premiership. Would he make the transition?
Conte, doing an amazing job at Juve, good eye for talent, knows how to get the best of young players. Might be a good fit if we could get him.
Klopp, solid job with Dortmound, quality tactically. Similar question to Moyes in terms of ability to step-up, but already seems a level or two above.
Bianchi, at Boca Juniors, only coach to win four Copa Libertadores.
Del Bosque, at 63 maybe a touch too old, but only manager to win the Champions League, European Championship and World Cup, but then with the Spanish team he had that should be a given.
So there are options, but not exactly vast and far from any guarantees on any of them. Conte would probably be my choice if we sack Moyes.