It got me thinking....'cuz I never really look into this stuff since I don't seriously consider that we'll move anywhere else....as long as the stepsons are here I doubt the wife will ever be convinced to do anything different.
Anyway, I suppose a factor in considering relocation in retirement is to have a (paid-off) house of at least equal value to where you'd be relocating to. You could spend some of your retirement savings on upgrading or purchasing a home in a more expensive market, but that seems unwise. So really, you're kind of locked in to retirement options based on where you've been living.
In our case, where the cost of homes is relatively low, that really limits where else we could go in retirement. It's a nice feature while living here, but it would seem to work against the notion of moving somewhere with pricier real estate further down the road.