[Si Coe]

That was kinda where I was going. As it stands now, the way the rules work means that the Worlds have to go where the people are willing to build a track that fits them.
The dirt part screws up places that need all weather tracks, the size part makes it hard in places where land can be expensive (the Japanese race on dirt, but most of their tracks aren't long enough) and the fact it shouldn't have been used before means you need to bulldoze your existing track to make it - no wonder nobody wants to host it!

So we end up with the situation that we have the South Africans willing to make a track that complies but nobody wants to race there, and people wanting to race in UK/Germany but no club that wants to build a track for them!