The MLB should bubble not only because it would make the game safer, but also because it could make the game better: many more highlight-reel plays, no eerie empty stands, and potentially quicker games.
More Fielding, Running, and Highlight-Reel Plays
Baseball does not need to be played in a stadium. If, instead, you play the games outdoors (bubbling in locations with good summer weather), you can dramatically increase the size of the playing field: foul territory as well as fair. With no stands, fielders will have the opportunity to run far into foul territory to make impressive catches. The home run walls could also be pushed back — possibly, very far back — creating many more opportunities for singles, doubles, triples, inside-the-park home runs, and highlight-reel defence. The MLB would become more like youth baseball, but with the best players in the world. It would actually be a real sport.
Less Eeriness, and Potentially Quicker Games
The ability of defenders to range far to catch foul balls might make the games shorter in length. (Pushing back the home run walls in the outfield, on the other hand, might make games longer).
More importantly, it would lead to a lot less eeriness – something the MLB is now suffering from a lot more than the NBA or NHL – as viewers would no longer have to look at big empty stands every time a batter hits the ball.
For the regular season at least, the MLB should consider ditching stadiums and bubbling with more exciting, less eerie outdoor games instead.