"Respectfully, I don't see it playing out like this. Every day we are closer to 100% access to testing that takes a day or 2 for results. Rutgers is administering saliva tests now. By September that will be a reality. So if a team you played tests positive then your team gets tested. Anyone testing positive is quarantined. It's the same thing as the flu. Kids get it all the time but only occasionally do you hear about it spreading through an entire team. And by the way, that fly vaccine argument people throw out there when you compare the 2, is bunk. Every year the medical community simply guesses which strain of the flu will be coming for that season. Often times they get it wrong. So the flu vaccine that we all get is pretty much ineffective for that whole season."
That's not the way this works. If you come into contact with a positive carrier, you need to self-isolate for 14 days to see if symptoms show up. The current tests will only pick-up positives once a person has enough of the replicated virus to test positive. That may not be until day 8 or 10 -- a week's worth of games and practices.
If you played a team on Saturday, and the following Thursday you get an alert that a few kids and the coach are sick and tested positive (let's say, the time it takes for them to get a test and get results), your team is only five days in to contact with carriers and will need to quarantine at home for at least another nine days, if not the full 14 -- no practices, no games -- to see if symptoms, and if one of your players or coaches develop symptoms, if you've had a practice on Wednesday before you started quaranting and had possible contact with rink staff or a game on Tuesday, now your team, the other team -- and possibly rink staff -- need to quarantine -- or at least, rink needs to close for a deep clean....
This is why contact tracking is so important if we want restrictions lifted: a person tests positive, all their contacts are told and go into 14-day isolation (along with their family, if they can't self-isolate) and see if symptoms develop. Along with social distancing, it's the gold standard for stopping the virus.
And right now, we still don't have tests for everyone with symptoms who need them. With many states backing away from testing all people and a lot of people refusing to even take the pandemic seriously -- not wearing masks, refusing to lockdown even in Red Phase except for essential work -- it's unlikely states are going to be able to do the kind of tracking and testing necessary for youth sports to reopen and stay open.
As for the flu vaccine, experts don't always guess the exact strains, but cutting cases by even 40-60% means fewer days out of school and out of work; it means getting a milder case instead of something that knocks you down for two weeks.
A "moderate" case of Covid-19 still takes about two-weeks to recover, but people with "stay-at-home" cases still report 6-weeks to feel better, and some will still test positive for the virus 40 days after symptoms start, even though symptoms have disappeared.