That would also mean that expansion should (rightfully) go to 1 more east coast team (20th league team) and 1 midwestern team (21st league team).
This idea would reduce the "when" of the 20th team, and 2nd NYC team being announced, and shift emphasis to which midwestern market wants in? Will the Minnesota bid come through? Will Saint Louis be able to find deep enough pockets? Will Detroit actually get to referb the silverdome and use it for mls? Will Milwaukee become a fierce local rival of Chicago and enter the MLS fray?
Right now MLS is looking for 100 mil to join for the 20th spot--so I can't see them actually using my idea and/or looking for less than that as a buy in to the league--and I think if they do split to 3 conferences, it would be silly to not look to move to 21 teams for the time being and then let the expansion stop for a while--this will allow the league to mature, attract/develop talent, and not further weaken the domestic talent pool.