Well, duhhh... You don't drop something when it's working. Most of the posters here who rant against SE aren't really against the structure of the MLS. They're just upset because the league doesn't resemble what they've followed in other countries--one or two big-time teams and a whole lot of no-hope also-rans.
I think most of us have no problem with SEM as a way to pool resources and reduce costs, etc... The biggest problems I see have to do with the transparancy of player movement and allocations. Weighted lotteries, trading roster spots and cap space for future considerations. And the perceptions that creates for some moves to be made that benefit one team over others. True or not - it is not out of the realm of possibility that MLSHQ can override one team for another. But right now I will give a little on that issue for a more league financial security. Its like trading civil liberties for more security. It doesn't have to be zero-sum, though.
Re: Well, duhhh... wrong. I understand why we have SE. I don't have a problem with retaining it until the league is in the black. I don't trust the front office and I don't like things like allocations and discovery picks. They're convoluted rules that may or may not be bent or broken whenever MLS feels like it. When each team has it's own owner you don't have to worry about who's getting favors and who's getting screwed.
It's possible for the league to keep SE while giving individual teams the power to sign their own players. SE doesn't have to mean the league controls the choices teams can make. This is the only real drawback I can see. Give each team a budget and let them sign the players they want, rather than the league signing contracts. Same tight rules apply. Of course, if the league is super invested in getting extra dollars through sponsorships, then SE needs to keep control of the contracts as well. Gotta keep those extra dollars hidden, or up the salary cap so those dollars aren't needed.