Should there not be a limit on that- in that eventually their front five gets so stocked that players move elsewhere to be first choice and get more £££££, as the cap bites in. Obviously the cap does not bite if you cheat, as Sarries did, but in theory no one team should be able to hoover up all the talent, and they must be getting close to losing some of that talent.
Regarding the saffer contingents, we don't hear much about EQP nowadays- but surely that kicks in? Looking at Sale in particular, you do wonder if it is to English rugby's benefit to allow things to develop as they have been.