Furthermore, I've proposed that the opening day national quadruple-header rotate more or less among the four cable networks: ESPN, Fox Sports 1, TBS, and Paramount Movie Network.
I've determined that Opening Day is set to fall on the Thursday between March 26 and April 1 every year from what I can gather.
TBS would not be the opening day network in years where the season starts on March 26, 27, or 28, to avoid conflicting with its NCAA tournament broadcast, so it likely can't be a perfect rotation.
The 8 teams that start their seasons in the national TV quadruple-header would have the following day off, then finish their series in unison with the other 24 teams over Saturday and Sunday.