Im guessing there will still be a euro championship of 9 or 10 rounds with maybe 4 or 5 of those counting towards a world championship plus 2 or 3 outside Europe. Not sure rallycross is yet ready for it and I do feel that IMG are running before they can walk. They have shown signs of getting it right recently, though how much that actually has to do with them I don't know, build on it for a year or 2 then see. Im sure the other classes will only do Europe, that's if IMG don't drop them altogether.
If it was to happen my biggest concern would be the tracks. Which other countries have proper European style circuits? I hope they don't go down the temporary circuit route or stadiums. Hopefully if it goes as it should to the US they will use one of the circuits used in 2011 and treat the americans to some real rallycross, who knows they may even get it