I went to a baseball game in america before and there was no athmosphere. the problem with american sports is that the country is so big that away fans can't travel to support their team.
The country should be split up into regions (maybe quarter ) to get a more "local feel" and have a few derbys, e.g. Boston Vs New York . The winners of the conferences could then play in semis.
I don't think it will take off over there as they have their own sports.