No what we should do is keep changing managers after every sticky patch.
Well yeah that's exactly what you should do until you find the right man. This notion of sticking with managers that are clearly not cutting it or have stagnated is footballing suicide.
Take a look at Liverpool as an example,
Roy wasn't the right man, gone in six months.
Kenny after a promising start got exposed as yesterday's man, gone despite his bonafide legend status at the club.
Brendan, good first year, great second, average third then after a woeful start to the 4th, sacked. No sentiment because of 13/14 the board realised it won't getting any better so sacked him.
Now they have who many will regard as the best manager in the world who has assembled one of the best teams in this country in recent times. Liverpool are reaping the rewards of quick decisive action.
So really in short you absolutely should keep sacking managers until you find the right one and if that one stagnates after a period of success you replace him and go again. Yes it would have been lovely and romantic if Moyes got through three years of struggles and started winning titles but in reality you would have turned into a bonafide midtable team had you given him that time, and every one knew it hence near enough every opposition fan being gutted when you sacked him and I'd wager it will be a similar song if//when Ole gets the boot.