seems like we see one of these every few months. maybe its true, but its hardly a problem we cant as americans drag our feet on. There are numerous practical reasons we have poor ipv6 penetration. not the least of which are:
understanding: greybeards and young guns alike in IT share an almost religious fear of IPv6 sometimes. Its a poltergeist most companies would care to avoid as well, as it would require hiring people who understand ipv6 as well as 4. not just the address, but how to route it, how to firewall it, and how to handle its DNS addressing. unless youre a firmly bunkered BOFH, youll have gaps in your understanding.
infrastructure: ipv6 has been in place at comcast and time warner for a while, but it requires DOCSIS 3 capable modems to handle the traffic and ipv6 capable wireless ap's in many cases. most americans who dont bask in the warm green glow of slashdot havent rushed out to buy a new modem when their current one is just as good. most cable companies were loathe to provide a free or subsidized upgrade (thats probably changed now that theyre common-carrier status) but it doesnt change the meat of the problem. To fix modems would require an upgrade not seen since we switched from analogue to digital broadcast television.
the web.: AWS sites still dont support ipv6. hosting providers like GoDaddy and Dreamhost have done a magnificent job of building out support but dedicated hosting solutions may still include legacy apache and nginx that dont speak 6. vendors like ironport speak ipv6 about as fluently as a slavic tourist, and in many cases proxy software and antispam actually reject ipv6 transported email as they cant handle reverse ipv6 lookups. many appliances rely entirely on hurricane or other public 6-2-4 proxes to maintain any semblance of support for the protocol. other companies like F5 networks have glorious support for ipv6, but few customers that care about it outside of cloud hosting providers.
do yourself a favour, learn it. Learn what it is and how it works, and make it a weekend project at home. youd be surprised how many people raise an eyebrow when you put 'ipv6' on your resume. For my countrymen here in the states, its coming. you cant stop it, and dual stack implementations already exist in your cellphones and public hotspots.