Southampton have been the mirror image of Pompey: rising to be relevant in the PL at the same time that Portsmouth dropped divisions. I do think that relegation would make baseball more interesting. But the way I've thought of it (with the current minor league structure) is three divisions of 10 teams with relegation and promotion between these divisions (but not to AAA, AA, etc.). The playoffs would consist of 8 teams: the winner of the 3rd division, the top two teams in the 2nd division, and the top 5 teams in the premier division. If the World Series winner happened to be from the 3rd division, that team would get promoted straight to the premier level, otherwise its the usual 2 or 3 top teams move up and the corresponding bottom teams move down.