A couple of quick points:
If prominent schools like Harvard, Yale, Stanford, etc decide to delay the start of the fall semester, or go virtual, it will be a quick domino effect to the other colleges and universities throughout the country, because many are still making decisions based on optics and CYA rather than statistical analysis (which have proven somewhat flawed with poor or incomplete data in the first place).
The NCAA has already stated that while they are willing to have competition in the fall without spectators (i.e. Football in empty stadiums) they will not have student athletes report to campus to practice and compete while the rest of the university is online or not started.
Cancellation of fall athletics is a strong reality at this point. All it takes is a few prominent universities (like Harvard) to go online, and the rest will follow and won't have much choice. I hear much about delaying football to the winter or spring, but if your entire fall semester is online, when do winter sports start? And more importantly, TV rights - how do you balance men's basketball and football?
This is the bubble that is going to burst post-secondary education and probably collegiate athletics.