To "Your worst nightmare", paraphrasing Chevy Chase, "...you stupid #$@%^" How old, exactly, do you think these homes are? Do you think they've been standing long enough (obviously neglected) to have had termite damage? I guess 100 years isn't long enough for them to have been completely destroyed by pests and water. You're right, these homes are going to be in complete and utter ruins...in 200 years.
Homes in Florida (take a walk down 6th or 7th streets on Amelia Island in Fernandina Beach (incidentally, I owned one of those "termite" infested places built in 1879), were built using heart pine. The sap from the pine trees acted as a natural insect repellent, and while they did have termites from time to time, very rarely was it enough to destroy the structure...as is evident by looking at these homes. If you are still concerned, perhaps you shouldn't renew your termite service on your concrete slabbed, styrofoam-on-the-outside-to-make-it-look-like-ornamental-block, home. Afterall, your house is impentrable because it's new and modern, right? LOL. Good luck with that.