Why don't those teams drop out of MLB and form a super league of their own? They could form their own television network and/or cut deals with existing networks. Ten teams would do it. Here are my suggestions:
New York Yankees
New York Mets
Chicago White Sox
Los Angeles Dodgers
Boston Red Sox
St. Louis Cardinals
Five from each of the two current MLB leagues. All but the Mets are traditional teams that existed long before modern expansion began in 1961. The Mets would replace the Giants who play in a small market.
Each team would have nine opponents. They could play each opponent 18 games. That's what was done after expansion from eight to ten teams in 1961 (AL) and 1962 (NL) before expansion to 12 teams in 1969 and the creation of the first divisions, east and west, and the introduction of a playoff system.
The Super League (SL) could have a playoff system that is superior to the existing MLB system. The first four teams would qualify with two best of seven series. Seeding in the first round would be: one plays four, two plays three. The higher seed would get home field advantage, i.e., play at home in games one, two, six, seven.
Currently eight of the thirty MLB teams make the playoffs. That's 27%. Forty percent of SL teams would make the playoffs. SL teams would play only among their own. MLB plays many more games outside of the stupid four or five team divisions, plus stupid interleague play, which is not done fairly because of natural matchups such as those between New York teams and between Chicago teams. Let the remaining teams go their own way. Who would care? Not SL fans.