idk, those phones were powerhouses back in the day and lasted quite a bit. But, gradually the hinges on said phones do go, and down the road, these hinges in the smart folding phones are bound to get damaged over time too.
I think once these phones get down in price, it won't be too much of a problem. Because if these become cheap enough, it won't be a problem to buy a newer one at some point. But as they stand now at those prices, I don't see people jumping at the opportunity to own one, at least not yet.