I could see a strategy that has a combination of on-line and in-person classes each week. This could retain the “feel” of on campus learning, while balancing the risks. It also might make it possible to schedule most classes in larger rooms as such rooms would have less intensive usage with fewer in-person classes going on. Such larger rooms could provide spacing for students and room between the teacher and students. All students would have the same resources and exams could be monitored.
The vaccine is a long time coming. Typically it takes years to create one. And we have 7.8 billion people on the planet to give it to. After discovery, the vaccine needs to be manufactured and then decisions made as to how to allocate it among the population. I honestly don’t see how Spring 2021 is going to be any different than Fall 2020 at this point from a safety standpoint - even under the unlikely case that a vaccine is developed by January 2021 (the earliest possible time according to Dr. Fauci). ND and ND families have some tough decisions to make. But I think all are best served by making these soon and implementing them - rather than believing that things will be different/better in 6 months.
Get the kids back to campus. And optimize the experience as best as possible. As noted above, the ND community and family are what distinguish the university. We can make it happen working together.