I haven't seen anyone else mention this, but I remember sitting in the first or second row of the student section for Baron Davis' last game at UCLA so I keep comparing the two situations in my mind.
The shock for me about Jordan leaving early was just to hear it might happen when he first announced he was going to put his name into the draft. Much like Maurice Drew, we'd been promised all along that he'd be back for at least another year, so the announcement came out of nowhere.
Contrasting that with Baron Davis' last game at Pauley, I remember yelling loud enough that my throat hurt, and clapping enough 8-claps that my hands were sore, the whole crowd trying to will him to stay in school for another year. Mostly, though, I remember one last cheer, and Baron turning around and looking at us as he walked off the court with a look on his face that let us know that he was gone. I wish that we'd had some sort of similar good bye with Jordan, but I wouldn't trade this year's run to the national title game for anything.
Those were the Lavin years, and the team continued to deteriorate after he left, even if I have a lot of fond memories of Earl Watson in the next few years.
Given the make-up of the current team, I agree with those who are saying that Jordan leaving now might be the best outcome for all involved. As good as Darren Collison was looking by the end of the season, Jordan probably would have had to split time with him next year, anyway, and it would be hard to make sure that Arron Afflalo, Josh Shipp, Luc Richard Mbah a Moute, etc., got their minutes too. There's enough talent on this team that it might almost become a problem with keeping them all happy.
As for Jordan? I don't follow the NBA since Kobe's mess in Colorado, but last I heard Baron Davis was still doing well. It might bode well for the precedent of sophomore guards leaving UCLA.
Jordan says that he's still going to finish his degree at UCLA, so my biggest hope is that he remains a fixture around the campus while going on to play in a few all-star games.