^^
Probably just the whole political culture of trying to project power (yeah I mean you, Sal DiMasi) instead of actually working together (especially since everyone's in the SAME PARTY) and getting stuff done. Instead of complaining about it being 25,000 construction jobs instead of 30,000, why don't you actually make a plan that CREATES JOBS? Having everyone in the same political party doesn't really help, there could be either 2 party gridlock or 1 party splitting into 2 factions gridlock, Massachusetts style.
This along with NIMBYism is a big reason why nothing bold or provocative gets done, everyone has to balance among the many political powers that each want a cut, including unions, politicians, and NIMBYs, watering down EVERYTHING and politicians having grudges against developers blocking some great plans, unions slowing construction down so they can charge more, politicians blocking whole projects for personal benefit (Cape Wind), massive NIMBY power due to Town Meetings and Public hearings, I could go on and on. It's a great city, but the political culture gotta change.