Maybe a more troubling situation for the feasibility of human brain emulation would be if we had had nematode emulation working for a decade or more but had made no apparent headway to emulating the next level of still not very impressive neural complexity, like a snail. At the moment there's still the possibility we're just missing some kind of methodological breakthrough, and once that's achieved there's going to be a massive push towards quickly developing emulations for more complex animals.