I'm not having a go at all, but the problem with playing the 'injuries' card for so long is that once you get into it, it's endless.
Let's ignore injuries that will change a player for ever, like Dragusin's or Betancur's. But once a player is back in training, it doesn't mean he is back to his best. It will take a few games, likely as many as four or five, depending on the time he's spent on the sidelines. So, again, if the results aren't up to par, we already know why. I might add that Postecoglou's style is particularly unforgiving for players returning from injury, but that's another matter.
What are the chances we get zero injuries in that time? Even if we only get a couple of those (only...), then it will be back to 'I never got the chance to play a settled side'. By that time, there will be only 10-ish games left to play and nothing to play for and by the same logic, he might be given another season, just in case his luck with injuries get better.
I understand the logic (even if I disagree) and I also understand that some spectacular results have bought him a lot of good faith and patience but, for me, an elite manager wouldn't have set us up the way we did at Everton and, if only for that reason, I wouldn't take another chance on him (but, then again, I don't think I've been asked for my opinion!).