[Jeritron]

Originally Posted by theexample As a Brit, I've never understood the appeal of baseball as a sport. But wasn't it popular for the experience? A day out at a classic stadium, hot dogs etc. Are the declining viewing figures relative to the tearing down of the classic and vintage baseball grounds? And the introduction of evening/night games?

They probably have more to do with the growth of other sports, and the expansion of entertainment in general.
Like everything else, it's more niche oriented. In the old days, when there were like 5 channels on the television, more people were tuning into/paying attention to the same things.
Nowadays, people can tune out of the world series to watch Keeping Up With The Kardashians or some shit.
The same goes for movies, and television programs. There were less options, so everyone was into the same stuff more or less.

Now the sports world is massive. There are entire channels dedicated not only to sports, but each sport. Since then, the major leagues of football, basketball and hockey have gotten on the map. Neither of the three were huge nationally like baseball was.

Also, his figures are misleading. The trend graphs show growth for nascar, and decline for baseball, sure. It's irrelevant though.
If you actually read the graphs and look at the viewers in millions you will see that they are scaled differently, and Nascar isn't exceeding the World Series by much, or at all, in all of those years presented.