Peter & Yakov,
We are at the point where action has to be taken, either to get CIDR the "proper way", or by forced proxy aggregation at some places in the Internet.
Let me suggest to pursue a combination of both. Folks who are willing and able to cooperate should pursue the "proper way", and the rest may be subject of proxy aggregation (which may be "forced").
You can't do proxy aggrigation without consent!!! You WILL create policy violations as well as destablizing global routing.
Tony, It might be the case that it is 'to expensive' to make the global internet to carry the costs of 'private policies'. I don't se any problems of implementing policy inside the AS that has the policy, even if things are announced as 'provider aggregates', just do packet filtering opn YOUR side.
Forget any concept of 'forced proxy aggregation'!!!!
What are the options? -Peter