I believe the issue is indeed about timing. For instance, if Trollope had taken over from Warnock after an indifferent start to the season, that would possibly have been a disastrous move for the club. However, an experienced manager like Warnock taking over the reins from a younger manager who was having difficulty getting his team to play proved to be a masterstroke.
I really believe as do most fans than the board has to move away from employing dinosaurs to take the club forward but to do so in the middle of a potential relegation struggle has got to be viewed as an extremely risky undertaking.