...should allow all current seniors one month of eligibility at the beginning of the 2020/2021 season. The teams could play some exhibition games, then they play the 2019/2020 NCAA tournament to start the 2020/2021 season, probably in the middle of october or so.
Current seniors don't have to be amatuers to keep playing. If they played this past year, they are eligible, regardless. But they only get eligibility through the NCAA tournament, and then they're done.