It depends on the circumstances. If he rebuilds over summer and we're still as bad then I'll be concerned. I'm not absolving him of all blame but any reasonably minded person can see that a lot of things, which are out of his control, have not gone for us this season.
I'm not talking in hindsight when I say that last seasons team didn't perform that well. I said so at the time. A year on and it's got worse which really doesn't surprise me when we've been missing the core of players that dragged us through last season.
RVP, Rooney and Carrick have missed chunks of the season. They were integral last season. Every game one of our defenders seems to get injured or suspended. Players have made individual errors that have cost us. Players have blatantly underperformed despite playing the same role they have for years.
It's been incredibly frustrating but I really do believe things will turn around. Either the players will click again or we'll reshape the squad in summer to make sure this doesn't happen again. That's pretty much my take on it.