Exit Plans and "Regime Libertarianism"
On the particular point of the Exit Plan, I've seen other intriguing arguments for and against — or at least, in some defense of and with objection to — the proposal, notably by Chris Claypoole and Tom Knapp, respectably, over at The Libertarian Enterprise.
(I'm still thinking of my precise take on it, though I do generally dislike the gradualism in the plan, especially the idea of moving the troops from Iraq another countries to continue the"war on terror." Certainly, I don't think Iraqis will be much better off unless they're allowed — not forced into by a foreign power — a more decentralized governance, which would likely lead to a partitioned or federated Iraq, as Ivan Eland has suggested.)
On the more general point of gradualism, Rockwell critiques what he considers a counterproductive approach to public policy and the questions of the state, looking at attitude differences and drawing the line not at minarchism vs. anarchism, but on a more subtle and yet possibly more fundamental distinction in how libertarians view the state. As he puts it in his defense of more radical minarchism,"There is a difference between seeing government as a necessary evil, and viewing liberty as the offspring of power."