But for a team to develop they must be regularly playing, but Argentina only play a handful of games a year. I think they should do what Italy have done and join the 6 nations as the tri nations would be a step to far for them. But it will come down to whether Argentina has a bid enough fan base and if they want to travel so much for each game.
England 18 - Argentina 25. The rugby powers, if they want to grow the game, get into the Olympics and so forth, must make more effort to engage the second tier nations, like Canada, US, Tonga, Samoa, etc. And yes, as the scoreline above, shows, Argentina -- who right now at least, are pretty much a top tier nation based on recent results. Having the second tier always playing itself does not further player development, more to the point, it does not increase interest which is what breeds long term success. This victory over England at Tw. will only fan a huge upsurge in the game in Argentina. (FWIW, I've flown heathrow-buneos aires and it is not a bad trip, 11 hours or so, nonstop, and only a few time zones.)