As for "the rush to sign him to an extension", who said it was a rush? Even if it was, and that's very debatable, there are good reasons to make that move when they did. By not waiting too long it gives him credibility with the squad and also signals to the squad their intentions going forward. It also allows the club to prepare for contract renewals the Summer transfer window in advance which is very important.
Saving the best for last, why should they have waited? Who is the better option for United right now who they could have signed in the Summer? Pochettino? So he's going to leave Spurs who will at this stage likely be in the CL next season on top of finish ahead of United in this year's CL?
Whee'll see what the future holds for Solskjaer. I didn't think it looks great considering the overall squad situation. There's a lot of quality there, but the majority of the best players could be gone come the start of next season. How he does between now and then probably won't be as good as how he started with United, but there will also be a lot of context to consider there one way or t other.
I do think Jose had to go. But to act like it was just him, and not the flawed squad was part of the issue I had to begin with. Part of whether or not Ole's going to do well is related to his squad problems, and probably more so who they actually hire for his DoF position. I just don't think that Ole is the guy with much in his CV to show that he can manage that type of club. I don't think a stint at Molde, a failed one at Cardiff really prepares a guy to run a club that massive. In my mind, he came in, was a breath of fresh air for what was a stale lockerroom that hated Jose, and that got him his initial run. I just don't think he's the guy you want to hook the wagons to without much showing he is ready for a full time of it. For what it stands, three guys with much better track records have failed for United, and at this point, if they don't go out and get a top level football guy picking and recruiting players, it won't matter if they have Ole or some dude off the street setting the lineup.
I concede there's something to showing the squad who is going to be around, but it doesn't look like that's led to any continued effort. They (the squad) didn't get off the bus for the match versus Everton, and at times, it looks like some of the effort issues that plagued much of Jose's time are creeping back into the squad. Did the signing of Ole make the big bump? Could that same bump in players wanting to stay have been created with a new hire of bit more quality?
I don't know exactly who is the better hire. I do think Poch is a better manager than Ole is. He's also shown he can get more out of players, has gone through some transfer window craziness, and might be interested in going to a club with a much bigger budget. If I'm at Spurs, and I'm losing Alderweireld, maybe Eriksen, and not signing a lot, maybe I'm tired of it. Where does he actually go from there with Spurs? He's maxed out in the league (and probably could go down the table), and sure, he's in the CL with a shot at a final, but what then? I also know United would pay him much more. He has the mentality to handle it, and I think he could pull it off there.