With HW1 (circa 2015), all the talk (from the showroom employees) was a self driving run from NY to LA that was promised to come soon. Sure sounded like FSD to me at the time. OK - maybe the cars have all the compute power and proper sensors. I do feel as if I was over promised/sold.
In 5-6 yrs, there will be vehicle to vehicle or vehicle to intersection communication that just might need new hardware to take full advantage of. Unless hacking is still too much of a threat, in which case just forget V2V communication.
Nearly 4 yrs old, I still don't think the time is right to trade up to a newer model S. Perhaps in a couple of years.