@Setanta,
If a protracted ground conflict does result (and Ghadaffi is already promising one) it won't be the first time that such an outcome - and long-term dependency on external "peacekeepers" and economic aid have been the consequence. UN forces have been in Congo and other African nations for decades. It is a bit like Joel Chandler's Tar Baby in the Uncle Rhemus Tales.
While it is certainly clear that the President and the leaders of all the other participating nations currently have no intention of being drawn into such an outcome, it is by no means an impossible result. Indeed it is very clearly in Ghadaffi's interest to achieve exactly that result - he will likely bet on the lack of staying power of the intervenors, and achieving through chaos and political means what he can't do militarily. There are lots of precedence for exactly that.
Moreover it will be far easier for many (not all) of the European powers, Canada, the UAE and others to recall the handfuls of aircraft they have sent (or simply to restrict their activities as some of our "allies" do in Afghanistan) than it will be for the U.S. France or the UK to withdraw. The fact that the current military "commander" (really only a coordinator) of the operation is an American general - with no successor yet identified - should be recognized as an ominous siugn.
Alternatively, Ghadaffi's forces may simply collapse quickly and a coherent and better political regime may result. The problem for us is that we can't count on either that outcome or the continued cohesion & committment of the "International Community". We have smacked the tar baby.