Hate to say it, but his days are numbered indeed our Moyes.
Cloud in silver lining for everyone else is, not many managers would touch them with a barge pole now because in the state of their squad and situation with the added pressure of clinging to be 'one of the best clubs in the world', managers would know that signing would be a death sentence to their career dreams of actually managing a top club.
Apart from an offer of unlimited treasure chest for a new manager, no one would want to be tangled in that mess. You reap what you saw I guess. It has been a long time coming but it has been forecasted many years back.
The smartest thing for them to do is to stick with Moyes, go through several years of mediocrity, eat humble pie and do a lot of overhauling with the limited resources they have. Should expect a lower turnover now when the consumerist empire they have built will leave them high and dry for a more en vogue club, and the loss in TV money and gate receipts. Short of their Qatari board member buying them, I can't see their performance on the pitch being fixed by a change in manager alone. In short, the hole has been dug too deep to crawl out.