More importantly just because they're not dying of it does not mean they're not a stress on the healthcare system. Testing has been terrible in the US, and the most reliable and LEAST deadly stat that I've seen that may have validity is .6% mortality rate. That part really isn't the rough part though, the rough part is the hospitalization rate. Roughly 4.6% of cases are needing hospital care, and depending on that age group, may reach 10%. Just going with the 4.6% that's 11 Million people who would need hospitalized if the entire US is exposed before a vaccine is produced.
The US has an estimated 1 Million hospital beds total.
Additionally there is probably a need for some supportive care by doctors visits of at least minimal nature for up to 20% of the population.
Next you're going to say this is overblown and every projection is wrong? The projections weren't wrong, the behavior of social distancing has changed the conditions. That successfully changed the R0 to being a pretty manageable amount right now. That is beginning to climb though as we are seeing the Mothers Day cases hitting the stats. I guarantee you by the end of this month we are going to see a significant spike in cases from Memorial Day.
Going back to the whole discussion at the beginning. To discount kids is to discount the virus carriers they are. How many times do we watch a bug fly through our schools in a hurry? How many times as a first year teacher did we get sick? Those kids live with adults, they visit grandparents - they'll take it home. Those kids make messes in the hallways, they grab onto an earlier age groups teacher for a hug... Schools are gigantic petri dishes. That's not even including the many kids we have in our schools who do have compromised immune systems from dealing with cancer or other maladies.
I'm not saying we should be closed forever, but to just say 'It's over, no more worries,' is going to invite disaster.
One last thing, you mention football scholarships like that should be the be all of the reason to have the season on time. How many kids will that honestly be? 2% at most of high school football players will earn a scholarship to play football. More to the point you don't think colleges would figure out how to deal with the change? They're already going to have to re-evaluate their students for next year just due to the loss of ACT and SAT testing opportunities.