Should more Americans be thinking about retiring abroad?

I'm an immigrant to the US from a developing country (albeit in the top tier of said "developing countries"). Because I don't have super-duper technical qualifications like most of my luckier compatriots, and because my career has been largely spent in the not-so-well-paying nonprofit sector, it was always in the back of my mind that even at the end of my career I might not have made/saved enough money to retire here. So a return to my homeland was always a definite possibility. Meanwhile, over the years I've seen the amount of money Americans will supposedly need to retire comfortably in their own country being quoted upwards steadily...from $1 million at one point to $3 or 4 million, or whatever crazy figure it stands at now. Given this situation, I keep wondering if more native-born Americans -- not just us transplanted outlanders -- should not also be thinking about moving abroad for their sunset (not golden, hee hee) years. What are y'all's thoughts on this? Have you considered this as an option? What policy changes -- e.g., making Medicare benefits portable abroad -- will help make this a more viable option? What are the possible pros for you? What are the possible cons?