I think the biggest reason by far for people moving off have compared to the olden days is that off campus housing is vastly superior to what it used to be. Night and day, in fact. It's not like people used to like the dorm rules any better then than now. Far from it. But it really was pretty rare for juniors to move off - maybe 10% did - and if there were even a hundred sophomores off campus who weren't South Bend natives, I'd be very surprised. I'd bet it was closer to 50.
But I'm sure this will go over with the current student body like a lead zeppelin. Looking forward to reaction when the levee breaks on this one.
I'm neutral, have no dog in the fight. I lived 4 years on campus and would again.