Here's where I'm at:
Dean is a great guy and coached us during a great period in which we got promoted following a record breaking winning run. Key players in Grealish, McGinn and Mings were, and are, too good for the Championship, which certainly helped.
We then went into a summer rebuild around those players. Recruitment has a lot to answer for, certainly, but Dean himself said he gets the final say in our 'transfer committee', so a certain amount of our window rests on his shoulders as well as Suso and Purslow.
With some notable exceptions, I don't actually think we have a terrible squad for this league and I do think a lot of them will go on to clubs in top divisions. The problem is consistency and that's across the board. Even with the aforementioned Grealish, McGinn and Mings. They're now very hit or miss and a lot of that has to come down to coaching and morale.
Another poster mentioned tactics and 'what's Dean meant to do? He's tried everything!' Well I don't particularly think it's a tactical problem. I think there's a confidence problem. I think there's a morale problem. I think there's an attitude problem. And, after the other night, I think there's a dressing room problem.
Whatever happens now, I can't see Dean leading us into next season, be that in this league or the Championship. Moreover I think now, today, is the best time for him to go beit of his own accord or with a slight push. We have 6 games left and whilst I expect nothing from them and relegation to be confirmed, we MAY get a bounce from a new manager. A period of 2/3/4 games where the problems I believe to be there are washed away by a new broom. Chances are we won't, but the owners have to try something, and that seems the only option to maybe have an impact on this season.
As for Dean, he's a fan of the club and got us promoted. There isn't a sour relationship with the fans, not to cabbage levels anyway, and there shouldn't be. He will be remembered for getting us promoted and having a go in the Premier League. OK, it hasn't worked out. I don't particularly think that's all his fault, but walking away might fix it temporarily, and keep him as one of our own.
As for who we get in? A temp for now probably. Someone who can bring a bit of hunger back to the dressing room. Someone who can bring confidence back and someone who can boost morale. Maybe Big Sam is that man. He's done it before, albeit with more games left. Luckily as others have said, by pure blind luck the teams around us haven't moved. We still have time, with a bit of a bounce, to maybe stay in this league.