Last I heard it was not if but when as regards Argentina joining the Tri-Nations, but yeah they'll be lucky to notch up many wins in it.
Thing is they're kind of in a grey area, because they'd likely dominate most of the Super rugby teams, at least if they were fielding their 2007 RWC side which obviously they wouldn't be, but still.
Very tough to find the right place to play teams who are a cut above domestic fair but a cut below the international heavyweights. Maybe there should be the old 5 nations and then 5 Other Nations or something.
Totally looking forward to Ireland v Wales, that'll be (literally) the match of the tournament.