Don't get me wrong here, I do not like the idea of a single pilot airliner, that will not be enough to stop " progress ", though. Truth be told I don't like the idea of single pilot business jets either.
Twenty three years ago when I started flying there was still a strong sentiment from the pilot group that getting rid of the flight engineer was a foolish, even dangerous idea... Now, not so much.
23 years ago was 1993. The FE was gone on new airplanes. The 757/767 was flying for over 10 years and was a 2 pilot plane. The DC9 was flying for decades with 2 pilots.
3-1 is not the same as 2-1.