It is pretty confusing with no real answers yet, just a lot of questions and random hypothesis by forum dwellers like me.
All said, from an investor perspective, I really don’t think there are a TON of S/X owners who prepaid for FSD and have both MCU1 and HW2, which, at the moment, seem to be in the worst shape. MCU1+HW2.5 was also a brief window from about August 2017 to March 2018, so again, probably not a TON of folks in this pool either.
In either case, Tesla can simply remove the option of FSD for any of these S/X that come back as trade in and limit them to basic AutoPilot, protecting them from future upgrade cost.
While I feel like they owe the early adopters SOMETHING, I don’t think they’re going to go crazy placating and accommodating us. Rather, I think the OG Roadster owners are seeing the balanced approach of Tesla realizing they’re important customers, but also realize they can’t drop everything for a few thousand, nearly 10 year old cars, so they capitulate on some discounts on new cars. I wouldn’t be shocked if the same thing happens to HW2+MCU1 and possibly HW2.5+MCU1.