For one thing, Bloomberg is not a fruit cake like Perot was before the 1992 election. He doesn't have to kiss butt to get monetary support. He's a billionaire.
I recall [link|http://en.wikipedia.org/wiki/John_Bayard_Anderson|John Anderson] in the 1980 election who left the Republican Party and ran as an Independent. Indeed I heard the man speak in Charlotte's Independence Square. The campaign turned out to be a fool's errand and shows the two party system to be impregnable.
I think Bloomberg can only help things by stirring the pot.