It's not that simple. We sacked Moyes within 10 months, and LvG as soon as things started to turn, despite an FA cup win. Mourinho too, arguably, after winning a couple of trophies the season before.
Being ruthless hasn't worked. Being patient hasn't worked. We're in this predicament because, more often than not, we've hired the wrong people and signed the wrong players.
The new execs seem to have started turning around the latter, but we'll have to wait and see if they have better luck appointing a manager.