MLB sells Games. That's their product. They're not going to make fewer products any time soon, any more than the NFL will.
Not disagreeing with your premise (yes MLB is selling games to the general public), but your missing a point of consideration.
Think of each game as a car rolling off an assembly line. The line can only produce so many cars/ games in 1 year (spring training, regular season and post-season). The post-season cars/ games are more profitable to the owners and the networks that show them.
The assembly line is maxxed out on the number of cars/ games that can be made.
At the moment the workers/ players get a certain percentage of the money for those regular season games/ cars and less (almost nothing) for the playoff games. IIRC the workers/ players get nothing for the spring training games.
For 8 fewer regular season games/ cars (lower profit for the owners in general), there can be 3 more playoff games/ cars which are worth much more (say 1 playoff game/ car is worth 5 regular season games/ cars) even when that network broadcast money is split between all the clubs.
ANY BUSINESS (Ford/ GM/ MLB/ Eaton/ Moen) is going to look for ways to increase the production/ number of more profitable items being produced, including the scaling back of production for items that are less profitable.
My hope is not to see a 60 game regular season. That is unreasonable & only a result of the COVID pandemic year.
Going back to 154 games (where baseball had the number for many decades) is possible & the owners/ players/ fans could be much better for it.