If "it requires extreme dedication" is a showstopper when deciding what sport you would want to play professionally, you probably shouldn't play any sport professionally. Even the 'easy' games such as darts or billiards require hours of practice every day.

But as to baseball: they have games. What are they complaining about? :)

If you pick an endurance sport such as cross country skiing, swimming, or rowing instead of a game (sport is "something with a start and a finish"; a game is something you play), you will easily be training every day for four hours or more for 8+ months in a stretch without ever entering a real competition.

All that for two or three races that count a year or, if you are really good, for one race every four years at the Olympics (rowing is extreme here, as it doesn't do races at different distances, and as it is rare for people to enter in more than one race in an event. Underperform in that race, and it is 4 years of training to get another try. Swimmers and cross-country skiers have it slightly better, as they typically enter in multiple races at an event).

The only plus these sports have over professional baseball is that sportsmen do not travel that much.