The World Series once matched the two "best" teams in baseball, or the best team in each league, as determined by performance over a whole season. Now it matches the two teams that are best "this week." At least one of those teams was often a marginal performer over the entire season but got hot at the right time. Who cares other than the fans of those teams.
Also, by the time you come to the seventh do-or-die series in three weeks, the thrill is gone.
The full season has lost its transcendent importance, and the postseason is just a second season, more disappointing than the first for all but one team and its fans.
That said, who cares as long as baseball remains financially viable and we can "appreciate the game," or whatever the slogan was this year?