[arin-ppml] IPv4 is depleted today - unrealistic statements about IPv6 inevitability

[John Curran]

On Sep 2, 2008, at 7:11 PM, William Herrin wrote:
> Doesn't have to. As long as the /24 lower boundary on routability
> holds, IPv4 will stay on a logarithmic growth curve that flattens out
> somewhere around 7M or 8M routes.

Just for my understanding, why would /24 remain a realistic lower
boundary?  Is this assertion based on an assumption that (all) ISP's
in a post-depletion situation will turn away prospects who show up
with a /25 or smaller IP block?

/John