As someone that has organized and run one of those big 'combined' matches (1992 Europeans, 30+ stages, 600+ shooters) and participated in several World Shoots, many Europeans and other large ipsc matches all over the world, after reading most of the comments I have to say that ...
Dammed if you do, dammed if you don't ...
Not many venues will accommodate that match (Las Vegas, Frank Garcia range in Fl, maybe St George), logistics are a nightmare, preparation is even worse. I know that I spend 11 months getting that match ready for not putting a single round down range in competition. I don't envy the team that will put that match together, whomever maybe will have my full support.