Too much money stands to be lost by not playing football at all for the year. Spring practice will likely be replaced by the spring season, whatever that looks like. Financially, most of the Big 10 athletic departments are seriously in debt from building their taj mahal facilities...and because of their contracts with major donors, they can't just stop or cancel many of those projects. TV money is huge, but playing in empty stadiums (PSU, OSU, Rutgers, Maryland) or 20% capacity is going to force default for many of the athletic departments...Other than the March Madness, early February to the beginning of April is pretty much sports doldrums...TV money will likely be available...And filling up the stadium will generate some cash - perhaps some hoops / football doubleheaders in places...
Meanwhile recruiters will probably be done by then. Three stars are likely to latch onto the "best" offer they have because there is no promise of any more offers...and the possibility of the offers they have disappearing. Some kids will drop to FCS or DII schools because they need to set up their scholarship, and no better offers have arisen because they didn't play in the fall...