For the WS the average age of the viewer was over 50 years old. Younger generations don't like baseball as much as NBA, NFL, and possibly NCAA football.
Anyone around my age (late 20s-early 30s) grew up in the age of Micheal Jordan, the 94 MLB strike, and Madden video game football. The only good thing baseball has had all to itself in the last 20 years is the 98 home run chase. And even that turned out to be BS.