As someone who has worked for almost a decade with safety critical software, system design and functional safety analyses (both aerospace and automotive) etc. I don't think I ever met anyone who believed they would be anywhere near FSD/Level-5 what-have-you in the timeframe they presented.

The only ones I met who thought so was managers and software developers and ML-people, i.e. people who has never in their life seen the level of effort it actually takes to get something qualified for RTCA or other safety standards.