A vaccine is the obvious end game, but it's not the only game in town. The development of therapies or treatments would entirely change the situation. Right now, there is no treatment. Even the use of a ventilator is simply a keep-the-person alive measure, not a way to make things better. Having a treatment available obviously changes everything. I believe there are 70 or so proteins currently being tested? While I can't speak to the science of that, the people I work with (I work in public health in a communications role - I am not an expert!) seem to think that it's reasonable to expect the development of treatments.
A non-science point...let us not forget how craven and greedy the NFL and its owners are! Also consider a scenario in which college and high school football don't take place, and the NFL could occupy TV slots on Thursday, Friday, Saturday, Sunday and Monday (or maybe 4 of the 5).