Agreed. This article does a lot of comparing to 2006, in which a lot of technology has happened — not just on the field but off. From what I've seen, many people "watching" games these days aren't doing just that, they're multitasking with three or four other things: checking feeds, timelines, stats, other game scores, fantasy updates, etc.
To me, in-game changes seem to be only a minor contributor. More so, I'd like to hear more about how people are so easily distracted these days. Notifications for this and that, work emails checked all night, game on in the background while surfing reddit or ESPN or whatever. It's becoming extremely easy to forget you're watching baseball at all.