France and samoa are tier 2 nations. How do u get them to tier 1? Grassroots decelopment, professional pathways and test matches against tier 1 nations. Hence the 4 nations setup, which has provided france, wales, png and samoa with such a platform.
The exact same thing as Argentina in the union sanzar comp, and italy in the northern hem comp.
It's not quite the same really. What the League is doing is a promotion/relegation system based on which hemisphere the tournament is based in, so it's funnily enough more like a pommy league system, but with a final thrown on the end of it. In Union it's more static and from what I understand, in the case of sanzar in particular it took a hell of a lot of convincing for them to consider adding the Argentinians due to the fear of diluting the competition.
I think having an expanded competition is a good idea for League, but it's clearly a developmental move and if it has the desired effect I can see it killing itself off to a degree.
For instance, if France can become seriously competitive again and start beating England, they'll draw in the crowds (nothing like having the France-England rivalry from a marketing perspective) and it could become a serious event on the League calendar. If that happens, I reckon you'd see the poms and France start playing 3 test series and maybe the whole 4N thing will become more rare because of the length of the club seasons.
I don't think that'd be a bad thing either - having a seriously competitive England-France series would do wonders for the game in England and France and it would make games against NZ and Aus more rare and special.