In reply to Gone for good:
Yes I agree, that Sevens is probably the best way to internationalise the sport. It's in the Olympics, it suits short multi team tournaments, and the All Blacks / Fiji only have about 14 minutes to totally humiliate you.
edit: re emergence of USA etc. All these countries were there at the first world cup 30 years ago, and yet no team has broken through in the 15 a side game. Argentina, Italy and Japan have probably all improved but not massively.
I'm not sure why cricket doesn't try to do similar with 20-20. England, Ireland, Netherlands etc. all play a mini tournament vs the tourists. I expect, like most things, it comes down to money.
Post edited at 14:37