It will TECHNICALLY still work at whatever version Nvidia cuts off support at, which is pretty soon for GTX cards (they've already cut off the mobile counterparts). So you'll stop getting updates, but it should still work as long as that driver is made available still in some form that whatever distro you are using can install it, or you compile it from scratch. I would not trust Nvidia's installer to still be working by then in it's current form because it's a MESS.