I'm decidedly not a betting person and I am in the crowd that thinks true autonomy is decades away. And yet I still think Tesla's FSD has considerable value. It boils down to its current and near-term capabilities as best-in-class driver assistance. If I was thirty years younger I'd assign less value to driver assistance, but at this point in my life I love it.
Whether it is worth $2k or $7k or whatever I won't argue: it depends to a great extent on the needs of the individual. It definitely has a higher incremental cost than competitors, but it is also better currently and with much greater potential. I've never heard of GM or Nissan offering a free OTA update to improve their driver assistance packages.
IMO buying FSD is a no brainer because its value to the owner will increase over time and, independently, it will improve over time. Its like the value grows as O(n^2) instead of O(n).
My only real gripe is that it goes with the car -- that is very backwards IMO. When I buy a software license and then upgrade my computer I don't have to buy the software all over again. Tesla's approach means I'm unlikely to ever buy another Tesla because I won't be afford the future cost of FSD and the older I get the more dependent I will be on having it.