I am in a similar situation with my current 77 CJ-7. I am "patching" mine, and I expect to get maybe 5 years out of it for now.
It makes a big difference exactly where your rust is, and if it is rust or rot. Check your Body Mount points, and basically any area that is load-bearing or structural. If it is pretty solid there, then the rest can be successfully patched for a while.
Mine is solid everywhere that counts (Body Mounts, Seat Mounts, Seat Belt Mounts, Spring Hangers, Shackle Mounts, etc.). I need to do lower rockers and a driver's floor pan, as well as new rear corners. Those are relatively easy fixes, if that is like what you have, and worth doing.