The way I'm reading this is as follows. Autopilot tech on HW3 is at its limit. HW4 with hi rez, wider cameras is the solution on fixing Autopilots glitches. Better LMFP battery. 15 years time there will be cheaper battery replacement with HW8 upgrades for retro Teslas. I most likely will be downgraded to a mobility scooter by then.