I have never understood the thinking that it takes longer to build a team to move away from the Warnock style than it did for him to basically rip it up and start again overnight.
Warnock put his stamp on that team from day one and it was evident from his first game. That is what managers with a clear vision do.

The key issue here is wanting to go in a new direction. If the club keep picking like minded managers and not spending much then yes it will take a while.
Pick a forward thinking manager and give him the cash to change it up and he would starrt to do so in the space of a transfer window, as Warnock did.

Long story short, it takes a lot longer to move from long ball, route one football if we keep picking long ball, route one managers to replace the last one.

The first step to changing this will be when the board realise this and put somebody there to at least try going in this new direction. This shouldn't take as long as many feel with the right man in charge.