I really wanted to. But it should be with eyes open. I'd definitely want to be in the U.S. in the event of, say, a third world war with China and the U.S. on opposite sides.
There's no reason to just assume collapse of the U.S. at this point. The big reason to move to New Zealand should be that you love the idea of living there. That'd protect you from any regret when we stabilized and moved past this danger to the usual peace and prosperity that draws people here from around the planet.
Btw, that does raise the question: As an older, soon to be retired person, just what would you be running from? Even after a RW takeover? I assume you have no one to take care of here, but that also means there's no one you'd have to worry about, who could get in trouble with the government who you'd have to try to protect and/or could embroil you in trouble. And retirees can, and usually do, live on less; and of course most don't have to have a job and would find it even easier than most to keep their heads down. In those societies, almost no one causes trouble, you know. They go about their lives, adjusting to lower incomes as necessary like everyone else they know, enjoying a lot of their old pleasures (sub music or dog training forum for political 
). 
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