Mark, you seem to have forgotten the other major (paying) multihull events, such as Extreme 40s; and I would not discount those giant trimarans that race across the oceans, around the world, etc. Those events give the Olympic sailors something to do post-Olympics.
Most of the sailors on those boats were in the Olympics first. I don't see a change, the AC (on cats) is just one more high-octane, paying event that is taking former Olympic sailors.
Mike