And if they allowed those lower tier nations to actually play with them in a proper competitive environment more than once every four years, then more would flow.
I agree (and as a Scotland fan this is dangerous territory) that the Six Nations and Rugby Championship should have a relegation place in principle - at the practical level, though, it would be a continual cycle through two or possibly three teams with the bigger nations not really worried. Italy would have been relegated in 14 of the 20 six nations championships - and it's entirely possible that the likes of Georgia who are probably the 'best of the rest' in Europe would have lost the other years instead of Scotland, Wales and France. The stranglehold in the Southern Hemisphere is even stronger, with Argentina coming last in each of the seven competitions they've been included in.
Has being in the six nations significantly improved the quality of Italian rugby? It's difficult to say, but it doesn't appear to have done so in a meaningful way. The Six Nations and the Rugby Championship, though, are competitions followed by people who are already fans, in the main. A World Cup is a chance to attract attention from those people who aren't already fans, that's why I think it needs to involve some of the lesser nations - it's not about making the whole tournament ultra competitive, it's about showcasing rugby, and part of that is having the top teams battle it out, and part of it is allowing the less established nations their moment in the sun.
O.