That's true.
But i think it's real good that these big sites add aaaa records for today. Hopefully the results will show that the percentage of broken users is really small.
Someone has to start deploying ipv6 - either isps or content providers.
www.google.com has aaaa 2a00:1450:4008:c00::69
www.youtube.com has aaaa 2a00:1450:4008:c00::be
www.facebook.com has aaaa 2620::1c00:0:face:b00c:0:1
www.bcc.com has aaaa 2001:4b10:bbc::1