A good thread so far. I really don't have much to add but...er....awww Hell, I got the urge to pontificate, so go with it...
Another option sort of, is the "Perpetual Traveler" (similar to Terhorst's method) gambit: you and your optional spuse are moving every year or even more often, perhaps making the circuit of several places you love. Terhorst seems to like Thailand and Argentina, for example. While I've yet to do it, this technique appeals to me (all except the wife part at least right now). Although I don't own much, I still like my PC, my stereo, my car, etc. And need a home base to keep all this crap. But that's for another thread.
I'm just a novice at travel, but I don't understand the motivation of these countries (mostly third world) that are cracking down on the tourist visa semi-permanent ex-pats. If it were a "civilized" country (let's say, Switzerland) I can understand why they'd not want transients there ... although reports are that illegal labor was welcome seasonallly at, say, the ski resorts. But we are talking about Third World countries that, you'd think, would welcome the dollars or Euros that even budget travelers spend. It's not like Mary Anne, Klaus, or Francois are working menial jobs for fifty cents a day, competing with the local labor force. In my travels in Mexico, I probably spent like $20-30/day on the economy, so you'd think my money would be welcome! Weird.