In answering this I'm going to try to not get into politics (just where it could affect the Mouse):
First off, I don't suspect that Markey is going to embrace the program, for the simple reason that he asked important questions, and Iger didn't answer them. Markey may not pursue (due to campaining), or his efforts to pursue in the House might get shot down by the majority party. But for him to publicly embrace it gives the appearance that he was bought. Something that his challengers (or a PAC) would certainly bring up.
As far as the election, it looks like Brown is going to run. That means this race will get national attention (only senate race in the country), and it won't be a layup. Lots of PAC money spent on both sides. And all this attention will bring up, yes, Markey/COPPA vs. Disney. Money will be spent to see that it is.
As far as bracelets go, logic suggests that (at least for the business convention guests) there will have lanyards for them. They have no problem wearing them at Coronado (once when I was there it was a 85/15 convention/family mix). And IIRC, I've even seen people at F&W wearing lanyards (and they definitely weren't CM's). There is a *very large* convention complex up I-4 that is convieniently located to other attractions.