Both major and minor league baseball set attendance records in 2004. Baseball is extremely popular again.
No sport is every going to dominate American life the way baseball used to back in the 40's and 50's but that has more to do with the internet, movies, cable TV, and about a million other things people could be doing for entertainment.
EDIT: oh, right now I'd say 75-25 Bills but it used to be about 50-50 just a few years ago....