I remember reading Golf Monthly editor Neil Tappin's article last year on one huge change he'd make to improve the game, and it related heavily to the introduction of more 12-hole golf courses and consequently rounds.
He talked about how it could well be the future of the game as not only would 12 holes take less time than its longer counterpart, but it would also save natural resources and ultimately take some strain off the planet - and that's certainly a message I'd endorse.