Only 2 and 3 are viable options for many. 2 is unpredictable. But 3 can be achieved by simply spending less in retirement. Plenty of countries out there where you can live on $1k/mo.
Yeah I don't disagree with your overall point about people retiring in low cost of living areas globally. I just don't think those people will be coming back, or would even plan to come back. Of course doing so greatly removes your ability for #1, which is about the only way to make sure you're not fleeced and discarded.