No doubt people don't want him to leave but, in this case, I don't think it's for selfish reasons. A head coaching gig for a team in a major conference, trumps pretty much any assistant coaching job, but Oregon State is not a good basketball program and hasn't been one for a while. Further, the program doesn't have anything significant that Hop could build on. He's a great recruiter who's been working with some excellent sales pitches at Syracuse. I don't know that he has many, if any, sales pitches to get a kid to come to Oregon State, other than just selling himself.
He could certainly be successfull at Oregon State and earn better jobs from there. However, I see it as more likely that he would struggle through his first contract and have a long road ahead in order to get a job at a more prestigous program. He might even hurt his chances of returning to Syracuse if he performs too poorly.
Right now, he's set up to be the head coach at a program that he is very familiar with, that has a ton of prestige. I wouldn't pass that up for an average head coaching job (which is pretty much what Oregon State is). He's in a position where he can afford to be very picky.