Just look in Philip Smiths routing summary that are also in my slides from RIPE i Amsterdam and also posted by me here a while ago.- those who already have an AS number, fine-- go for it (these would
possibly contribute to some 1,000+ routes in IPv6 DFZ, the absolute number
is peanuts, but of course there may be some layer 8 (and up) avalanche
effects)
Where do you get this? There are more than 25000 AS numbers out there. At some point, most of those networks will want to run IPv6.