Overall popularity and viewership for a once every four year event is not necessarily the same thing. People will casually watch an event that is the pinnacle of a sport that happens infrequently.That being said, I am not convinced you would see baseballs popularity go up if the World Series was held every 4 years. In fact my guess is that the opposite would happen as that would do nothing to fix their age demographic problem and would like exasperate it even more.
For example, I enjoy watching soccer but it is hard for me to get into games in general. However, I watch a lot of the WC because you can feel the intensity of the games just by watching them. The overall importance and feel is palpable and really enjoyable to see (yes even 0-0 games). Other than WC I probably watch less than 1 game a year.
For the main topic of this thread the point many of the complainers have not grasped is that all 0-0 games are not created equal. Just like in any sport you can have a great 0-0 game and a garbage 0-0 game. The game play matters. Scoring does not equate to good game play or excitement. In fact too much scoring can sometimes diminish the importance of scoring which lessens the excitement of the game.