Let me see, roughly 15 years ago the 386 SX came out. There are how many of those still left in homes? Other than as collectors items, I don't think you can even give those away.
30 years from now, our current computers will be an interesting historical footnote.
So, I don't think I'm going to worry about 2038...
In fact, in 30 years, I may be a historical footnote, and probably not very interesting, either.
In fall of 1986, I was using at my job one of the very first Compaq 386 machines. 16 Mhz, 1 meg of memory, 40 meg hard drive, EGA monitor. Cost seven grand at the time, or about 11 grand in today's dollars.
The software I wrote on that machine for direct response media analysis continued in use until fall of 2000 - running on another 386. So software can hang around for some time, on otherwise obsolete machines, as long as it does the job. But 34 years? Not at the rate of change now.