I’d like to see something supporting this idea. I don’t think the “vast majority” like to watch sports. Not even close.
Last I read, something like a third follow football regularly. Another third off and on. The remaining third, not at all.
Think about how few women follow sports. That alone cuts out “vast.”
This chart is the latest thing I could find. It's a Gallup poll from 2017, I doubt it's changed much since. It says 57% watch Pro Football and 51% Pro Baseball and so forth. I'm not saying that the vast majority like any particular sport, but that most are sports fans of some type. Even those who don't watch a sport during the season want to see the Super Bowl, World Series, The Masters, The World Cup in Soccer, The Olympics, etc. I think it's safe to say that the vast majority of Americans like to watch sports. Gallup-Sports-Fan-Bases-in-US-Oct2017 - Marketing Charts
Here's another article based on a Gallup Poll. It states that 60% of Americans identify themselves as sports fans. As Industry Grows, Percentage of U.S. Sports Fans Steady
Aren't the most watched programs usually sports programs? I don't know, you could be right.