For 2021 the minors will be changed drastically from 2019, and not just due to COVID.
ESPN has an article up about this. A summary of the biggest changes
- Down from 160 teams to 120 - 4 per club max
- Some independent teams might become ML affiliates
- No rookie and short-season Class A levels. Lower-level players will train in their major league club's spring training facilities in Arizona or Florida. So goodbye Vancouver, nice having you as a Jays affiliate but you are now on your own.
- MLB will take over merchandising, broadcast and sponsorship rights, splitting revenues 50-50 with the minor league clubs.