Hopefully Manfred will impose a season of at least 60 games as a compromise, maybe even the 72-game schedule that the owners last proposed. There is a little bit of leverage the players have in that they have not agreed to the expanded playoffs that the owners want. Manfred must realize that a 50 game proposal with the regular playoffs would be seen as ridiculous.
So I think he adds as many games as he can and gets the players to agree on expanded playoffs.
None of this will stop an ugly work stoppage negotiation after 2021, but if Manfred does a little more than the bare minimum it might be seen as the seeds of where the next negotiations can go. I think there is wide consensus among analysts that the players "lost" the last CBA as compensation has not risen as fast as revenues. MLB probably realizes the players deserve more revenue, but have no good way to deliver that short of a salary cap and a defined percent of revenue.