Kepler
Si certus es dubita
They murdered about 20%, and realigned another 20%.
AAA and AA are relatively untouched. Single A and rookie ball got hammered.
Well, it's been an inexorable process that began in the 1950s. Never forget there were once B, C, and even D leagues, and hundreds of minor league teams. We once had the equivalent of British soccer before the majors got their snouts in and destroyed.