There's also the problem of how to provide incentives for those virtual ADs.
Ditto for PC members. Being a member is the incentive; the IETF is a volunteer organization. If you can find a dozen or so people to stop what they're doing and be ADs, you can certainly find more people who will participate if they can do so at a lower level of commitment.
Are you sure you can find the people?
What went wrong with ICAR (Improved Cross-Area Review)? It was closed due to lack of activity; 12 people enlisted as reviewers, just a single review conducted, the reviewers didn't deliver.
See:
http://www1.ietf.org/mail-archive/web/icar/current/msg00293.html http://www.machshav.com/~icar/ http://www.machshav.com/~icar/reviews/people/
It is not clear you can just simply find people to actively contribute in this kind of activity.
-- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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