I think it is just the desire to do something different, to try a new approach. It is always a **** appointing a new manager, sometimes someone just 'fits' at a club and doesn't do so well elsewhere, John Coleman and Keith Hill are good examples. If you have a manager who has held 2/3/4 jobs, never been sacked and always left each club higher up the pyramid then when they joined, you can see why fans would be attracted to that.
I get that. Every time we sack imagine, you read the same 'well it can't get much worse' whilst wanting a manager the polar opposite to who we had previously. I think just about every manager who has managed us at League One level has eventually been sacked by us? I guess it's a tough job when you're playing above your natural level and up against it week in week out.