Right now QCs are advancing. It’s possible to forever advance but still be going up against an unfavorable asymptote over which you’re unable to cross, of cours

Right now QCs are advancing. It’s possible to forever advance but still be going up against an unfavorable asymptote over which you’re unable to cross, of course, but year after year, qubit fidelities are increasing, error rates are dropping, qubit counts are increasing, and the zoo of quantum technologies (superconducting qubits, ions, neutral atoms, photons, and silicon dots... among others) are blossoming. I’m “bullish” on the whole thing. In my opinion, it would be hugely unwise for anybody in the field right now to call it quits without seeing the technology through further. There are too many “interesting” developments happening. I think that in about a year we will know the true nature of the Google supremacy claims as experts from many disciplines both stew and weigh in on the matter. If supremacy (continues to) hold up, that would be evidence against the “20 years away” sentiment. I agree with what you said, QC has a lot more going on / going for it than fusion does. They both still reside in roughly the same “technological class”, but QC at least seems to be improving regularly with a combination of steady engineering as well as scientific breakthroughs.