The option to split the country into three is written into their constitution. Sort of like a prenuptial agreement.
If it happens, the oil revenue split will sort itself out along geographical lines and the Sunnis will get zilch. And an oil-owning Kurdistan would have to arm itself for defence against Turkey.
An Independent Kurdistan could be a reliable US ally, but it would be LANDLOCKED, making it dependent on Syria, Iran, or Turkey to get the oil out.
And given the short-term memory of a looming Democrat Administration if they win 2008, the Kurds will likely be left alone to fend off the wolves when the time comes.
There has been discovered substantial ammounts of oil in Sunni Anbar province, which have yet to be exploited.
Turkey wont do anything but squawk if we have several large bases in Kurdistan keeping an eye on the region. Screw Turkey - they are only marginally useful now anyway. The cold war is over.