"mostly because people have figured how to do more with their existing IPv4 addresses,"
Quite. So if it's not broken there is no motivation to fix it.
"But it is very hard to implement IPv6 in an IPv4-only ISP"
And if you cared, you wouldn't chose an IP4v ISP. If you have a choice! But if stuff just works, why would the average punter care?
Biting the hand that feeds IT
