A single permanent site will never happen. What I think would be better would be like The Open golf, they have half a dozen locations that are rotated between in a semi-random fashion. Other locations can be added to the rota if they prove themselves. And the locations should be country based rather than city to spread the load.

But I think due to the corruption of the delegates that will never happen either, they get too many kickbacks from being part of the bidding process.