Yess to expansion! Although the divisions are nice and even with 5 teams apiece, so it seems unprofessional to make them uneven again. If we added two teams, I'd like to add enough other teams to even up the divisions. We should add 1 team to all 6 divisions.
If MLB ever puts the DH in both leagues (which I would oppose) then it would open the door for more rearrangement of divisions in theory, which would make adding more teams easier. With the DH in both leagues, the classification of "AL" and "NL" becomes meaningless, since they would both have the same rules and both be all around geographically. In sports, teams are sorted into divisions, where teams with similar geographical location are put in the same division. There'd be no point in the current division layouts with the DH in both leagues, because the leagues are not "East VS West" or "North VS South". The AL and NL both have eastern, western, southern, and northern teams. The thing that keeps the closest teams from being in the same division is the designated hitter rule. With the DH in both leagues, the divisions would have to be completely rearranged, or they'd make no sense. You'd have to change "AL East" to a "Northeast" division consisting of something like the Blue Jays, Red Sox, Yankees, Mets, and Phillies. Then there'd be some Southeasty division consisting of perhaps the Rays, Marlins, Braves, Rangers, and Astros. You get the idea. Creating a new division while adding 5 new teams would be possible with a division allocation type like this, which requires 1 less new team than adding 1 to each current division. Can't create a new division with the AL and NL the way they are, cause it would unbalance the leagues.
I don't want the DH in both leagues, so I would hope that we just add 1 new team to each division, even if that's kind of a long shot. The disadvantage of more teams is that it's already hard enough to win the WS, and with more teams, the odds get even slimmer. I would like to see the first round of the playoffs increased to a 7 game series if there were more teams than there currently are, to add more fairness, and make the playoffs before the final four feel like less of a jip.