"IPv6 addresses are ugly" is only an argument for as long as ipv4 addresses don't cost anything. as soon as they put a price on it, nobody's going to care.
And yet still, nobody cares.
Hundreds of million of users in Africa that are growing at a very fast pace, still on IPv4.
In Europe outside Germany and Belgium, the IPv6 usage is between 5-20% max. Millions of people.
There is also millions of industrial systems, ATMs (heck, some of them still run XP!), and whatnot that will not get IPv6 short of complete replacement.
You can't price IPv4 out with that kind of numbers combined with the fact that it is an extremely open market.
As the extra cost of IPv4 keeps rising it will sooner or later outprice the cost of moving to IPv6.
Similar as with fossil fuel cars -- super convenient, there are petrol stations everywhere. But as the price started rising (assisted by very harsh taxation) suddenly the idea of switching to electric didn't seem so bad.
There is a very sizable IPv6 population in Asia.
https://6lab.cisco.com/stats/cible.php?country=CN&option=pre...
https://www.google.com/intl/en/ipv6/statistics.html#tab=per-...