The Athletic reports that a universal designated hitter and expanded playoffs for 2021 are off the table (link may require a subscription):

An expanded postseason and a universal designated hitter for the 2021 season are both dead issues with no recent movement or planned further discussion, multiple people with knowledge of the communications between Major League Baseball and the Players Association said this week. While reversals never can be totally ruled out, both sides are proceeding as though there will not be any last-minute addition of the DH in the National League, or additional playoff teams from the current field of 10, for 2021.

TheAthletic.com

While there are many reasons given for the lack of progress on the issues, including the players wanting them decoupled, it would appear that the MLBPA would like to use these as leverage in the upcoming collective bargaining agreement.

Even with the designated hitter in 2020, run scoring dropped. With a return to the designated hitter and a deadened ball, and it might be a good year for some great pitching performances.