As previously suggested, the 2021 season parameters are far from settled . MLBPA and ownerships are both floating new proposals including a 154 game season, deferred ST and season start, travel restrictions on Blue Jay games in Canada, DH in NL, expanded playoffs, etc. There will be some serious waltzing around as the Covid vax programs gain minor momentum and Manfred looks for some cover.
I know MLBPA has previously rejected some ideas like the NL DH. That is a strange one since they use the DH in AL city games and it creates jobs for some guys who can no longer play full games, usually highly paid mature hitters. In the near 50 years of usage in the AL, I think it has been a great enhancement to the game . Ortiz would never have survived a couple of season back in the early 2000's without it, but now he is a likely HoF'er ( maybe 5 ballots in)