University & 4th aren't within the boundaries of campus.. they serve the residential/commercial areas that border it. I'd like to see calming there but closing them down would be a mistake, especially with Washington Ave now being closed to through traffic where it abuts campus on either side. Incidentally, this was the major street that caused issues, in my opinion, for student access/comfort/etc. Campus spread past Washington without removing it as a primary artery into (and through) campus. With the LRT and ped/bike/transit mall, this will be FAR better.
While the U has a few streets in it, I'd hardly call it overly busy or anywhere near auto-dominated. Church cuts off between Northrop and Washington. Pleasant, Harvard, and Pillsbury are the only other streets bisecting campus, and they are all skinny, slow, and low-volume vehicle-wise - mostly for delivery vehicles and campus police. Most people don't park within the EB borders, they park at the garages/lots on the fringes (Riverside, 4th St, University Ave, lots surrounding TCF Stadium, etc). I don't know that there are many places in Minneapolis or St Paul so devoid of cars and full of people. By comparison, UW-Madison (while an awesome location with great sightlines and amenities), is fully integrated in to the urban fabric. Also, keep in mind that the U of M is a FAR more urban campus than Notre Dame. We carry things like light rails, buses, people driving/biking/etc to downtown for work, etc. Notre Dame and South Bend, like many other campuses, are basically college towns that serve different needs and relate to the surrounding context differently.
I know University doesn't run through campus but students live right there. There's little off-campus housing at Notre Dame. Almost everyone lives in the dorms on campus. I was looking at student housing/Dinkytown as basically an extension of the campus because that's how it effectively acts.
I'm not advocating closing the streets but making them much more pleasant, green and pedestrian friendly. Hence the parkway concept. Something along the lines of Summit Ave. or King's Highway would be nice. Imagine the block between 4th & University as being the median.
And though the bisecting streets might be narrow, there is really a different feel than in a fully separated campus. And sure, Notre Dame is physically separated from South Bend. It technically isn't even *in* South Bend. South Bend really isn't a college town at all because it is so separated from campus. The joke used to be that there's plenty to do in South Bend. For example, you can go to Chicago.
But really, South Bend is a pretty interesting place once you get past the rust belt aspects of it.
All I know is that when I walk around the U campus I feel "off." It doesn't feel like a connected, integrated place. Even UW Madison somehow has a more integrated feel to it. Maybe it's not the streets but something else. Michigan has the same problem, BTW and Ann Arbor *is* very much a college town. I spent seven years at UM and the place doesn't feel like a campus so much but rather a collection of job training centers.