College sports can start when the colleges begin normal operations, which will require IMHO (where the H got skewered by an IV needle) the following --
A much, much, much lower daily infection rate -- say fewer than 200 new cases per day for the US of A. (Now we're at 30,000.)
Unlimited availability of tests -- so every student and staff member gets tested -- at Duke, that's about 50,000 people.
Provisions to isolate those testing positive (as Duke can do) and serious efforts to track all contacts with those testing +.
Some "rules of the road" for off-campus travel and connections.
These onerous -- but do-able -- conditions can be relaxed a bit if there is a proven therapy (treatment) that is available in large supply. But I think testing will be a requirement. Or, maybe, maybe a proven vaccine. I'm not holding my breath on the last -- too tricky to predict. May make some progress on antibody injections -- but those would offer temporary immunity.
Now does that mean 100,000 people at the Big House? Oh, I don't think so...
Sage Grouse
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'When I got on the bus for my first road game at Duke, I saw that every player was carrying textbooks or laptops. I coached in the SEC for 25 years, and I had never seen that before, not even once.' - David Cutcliffe to Duke alumni in Washington, DC, June 2013