The issue with using MLG is that if MLG becomes the so-called standard (it's only a standard to those people because they're the ones who run the largest Halo tournaments in history), then it will be tough for 343 to introduce any kind of rule set. Now, MLG has had some good rules in the past, no doubt about it, but 343 needs to be able to alter their own esports rules when they feel the need to do so instead of waiting on MLG to come out with v1, v2, v3, v4, v4.5, etc...
Blizzard doesn't have to put up with this crap. They run SC2 tournaments and it's the same damn game everyone plays, pro or noob...it's the same game.
Make a solid universal setting and make it the standard in the esports playlist from day one. Let it evolve over time, kinda like how Capcom adjusts their characters in Street Fighter. MLG doesn't even need to be catered to, it's not necessary.
343 has in-house Halo pros that can provide more than enough, and on top of that, 343 can basically call up any other Halo pro into the studio and pay for their help/consulting. MLG doesn't own the Halo pros any more.