"Nobody has demonstrated it (publicly), so it cannot exist anytime soon" is not a very good argument IMO. Your post reads a bit like that nobel prize winner wh

"Nobody has demonstrated it (publicly), so it cannot exist anytime soon" is not a very good argument IMO. Your post reads a bit like that nobel prize winner who in the 90's said the internet would become similar marginal technology as fax machines. Just because nobody had demonstrated any revolutionairy use case for it at the time. We went from barely having computers and no significant internet to what we have today in 30 years. "We'll be long dead", yeah maybe if we don't die of old age.