Dr. Fauci's path for sports coming back this year:
- No fans in arenas or stadiums.
- Athletes, coaches and other essential personnel stay in one big hotel (preferably connected to or next to the arena or stadium).
- Constant surveillance and weekly tests. https://www.usatoday.com/story/sports/2020/04/15/coronavirus-dr-fauci-sees-path-sports-comeback-without-fans/5136306002/

I actually think this would be possible if the NBA and/or NHL wanted to hold a 16-team playoff over 1-2 months with eliminated teams returning home. I don't see how you could do this for a 4-6-month NFL and/or MLB season.