When Holloway took over we were en route to a poorish league position - not relegation. It has taken poor management of an exceptional level to achieve relegation. In fact, by his own admission Holloway was talking of a play off place when he took the reins.
The big difference between Levein and Kelly to the Holloway era, is Mandaric's money - we don't know how Allen would have gone on because he was only here for 5 minutes, but we do know that Holloway has made very poor use of the money made available.
I can't get my head round any logic in what you are saying. It reads to me like you are saying that we have had a succession of poor managers so what's new about Holloway and we might as well stick with him.
Your position is not only illogical, it is also totally defeatest.
I am not certain Holloway will be sacked because clearly there are financial implications as well as Mandaric's well documented difficulties in making decent appointments. Now made much more difficult by relegation.
If it is possible I think he should bring in Paul Ince. At present, Leicester City is still, I hope, a bigger club than M K Dons - and he might be persuadable. Give Holloway another season and so then we may have fallen below MK Dons in the ratings.