The Bill Gates quote at the end is unsourced. In the unlikely event Gates ever actually said or wrote that, somebody would have a citation.

He denies it himself, but a plausible explanation given here is that he perhaps meant '~ in the lifetime of this system': https://skeptics.stackexchange.com/questions/2863/did-bill-g...

(It goes back to 1985 apparently, so does seem unlikely it came from nowhere, since it wouldn't have seemed so ridiculous then.)

It would be interesting to see how many of these criticisms are criticisms of these things as they stood and not for their potential; it seems ridiculous to place the onus on the critics to see if someone can execute well in the future.