Just to drop a bit of bait into this lively discussion :-9 - we could actually afford to give every organization that reasonably claims to serve IP connectivity to more than 1000 customers a /24. There's 10 million /24s inside FP 001. All in all, the RIRs have about 20.000 members today - 1/500th of that.
Now those are numbers that I can understand. I think everyone knows what a /24 is, because even in IPv6 it is the same percentage of the total number space as it is in IPv4. Either we accept the fact that 6RD relies on assigning address blocks sparsely within the allocation for technical reasons, and just give 6RD ISP's an allocation big enough to do the job, or we write a special policy for 6RD ISPs. There are only 2 reasons that I can see to write a special policy. One is to encourage ISPs to assign /56 prefixes to customers, not longer ones like /60. And the other is to restrict 6RD allocations only to ISPs that maintain a certain amount of density, i.e. if an ISP has lots of IPv4 allocations scattered all around the IPv4 number space, we might say that they cannot have an IPv6 allocation to cover more than x number of IPv4 /8s. But given that there is no shortage of IPv6 addresses in the foreseeable future, I'm not yet convinced that a new policy is needed. --Michael Dillon