i like this question as a thought exercise, especially now that i have such a knee jerk negative reaction to the word.
first, i agree with anok's comment.
the idea of each of us as little colonies seems entirely in keeping with "kill the cop in your head" or even a little more sophisticated than that.
also - the thing that i like about decolonize *especially* in the context of occupy, is that it is a negative and so is in synch with anarchy as being against, rather than promoting a plan.
i continue to have problems finding words to express who the enemy is (or who i am allied with), and in another space, "decolonize" would be as good a choice as any that exist now.
edit: this answer coincidentally mentions colonization relevantly