"..immediately replaced by his son Saif"

You cannot assume that Libyans would consider the son the embodiment of Libya the way Gadhafi is now seen by many Libyans.   A much better analogy would be the end of the 3rd Reich.   Removing Gadhafi will cause his state to collapse--because of the way he has constructed it--as Hitler did in Germany.

A $10 million price on Gadhafi's head would test the loyalty of his mercenaries rather severely. And is likely to save the West (and the insurgents) a lot of grief (and money).

If you think Saif is held in the same esteem, let's have some evidence.