According to the Athletic, the 50-50 revenue sharing split floated by Major League Baseball is off the table (link may require a subscription):

The players’ opposition to a concept it equated to a salary cap is why the league ultimately decided not to propose a 50-50 revenue split with the players for 2020.

MLB appeared intent on introducing such a plan until union head Tony Clark told The Athletic two weeks ago, “A system that restricts player pay based on revenues is a salary cap, period.” Although the league disagreed with that assessment, the commissioner’s office seemed to realize further pursuit would be fruitless. Some form of revenue sharing might exist in a new proposal, but it will not be the central mechanism for determining player compensation.

TheAthletic.com

That’s good that MLB is not going to fall on their swords over a particular plan of action. It is possible that an 80% pro-rated salary, 20% revenue sharing split would work, since it is possible revenue sharing would increase player salaries if the fans come back.