With HD ratio of 80%, the operator would require a /23.
Just because a HD ration of 80% is the minimum utilisation required to get a subsequent allocation, this doesn't mean that higher utilisation can't be achieved in some (and shouldn't be an aim in all) cases.
I can imagine DSL operators offering /64 (single subnet) and /128 (single host) assignments to some customers (in the same way that single IPv4 addresses are often assigned now),
But this is non sens and I hope that the others ISP will not do such a thing. Nerim is a small DSL ISP. We have 2001:7A8::/35 and we will give a static /48 to our custommers. It's simple, we have enough adress space (the RIPE-NNC had no objections) and it cost nothing more than dynamic adressing -- Xavier Henner Responsable de l'exp�rimentation IPv6 Nerim -- Fournisseur d'acc�s � Internet URL: <http://www.nerim.net/>