The internet only works as long as 99% of all people carry 99% of all routes. When a sizeable number of people starts filtering a sizeable number of routes for whatever reason, either technical (won't fit in their routers) or political (don't agree with the policies) then we're in knee-deep brown stuff.
And this is something that RIPE and ARIN cannot directly change. RIR policy can only encourage or discourage ISPs from carrying 99% of all routes. I think that the current policy for IPv6 is one which discourages people from using IPv6. Adding a second type of IPv6 address that is allocated geographically to allow greater topological aggregation (i.e. based on which city the network is in) will encourage use of IPv6 by making it easier for people to get IPv6 addresses. --Michael Dillon