So make a statement now that whoever it is you will hand them a season of support as long as we're not in, say, the bottom five at any point past the first 10 games of a season...
Why should anyone give any manager a season of support? Managers who go on 15 game losing streaks don't get to keep their job when theirs no tangible evidence of improvement.
Managers get support when people can see they're doing more right than wrong. Losing game after game after game means ANY manager will lose their job. Everton aren't in some exclusive club to be the only team who sacks failure.