What's happened to Biarritz? They've gone from being top European contenders to mid-table Pro Deux.
Money is what's happened or rather lack of it, you have teams like Clermount, Toulon, Saracens, Harlequins, plus other wealthy English and French sides who prefer to buy trophies rather than develop their own local players, very similar to your Real Madrid's, PSG's, Manchester City and Chelsea's in the soccer world.
It would be better if Soccer and Union followed the Super league salary cap and made it a level playing field, with well run and financially managed teams like Cas Tigers are able to compete fairly.
It would be great if for example Saracens, Toulon, Real Madrid, PSG and Chelsea all got relegated and their respective leagues where won by Oyannoux, Worcester Warriors,, West Brom, Bilbao etc.
Sadly money is everything in sport at the minute.