If they keep it like it is even after the expansion, that every even patch brings us a main raid (like coil), while the odd patches give us the large casual raid (like CT), they should get rid of the 1 drop per week lockout in the casual raid.
That gear is inferior to the real raid gear/upgradeable gear from the beginning and doesn't really serve any purpose to your main class. But it would help to gear up your sub-classes. In a game one char can be any class you shouldn't be forced into gearing 1 class only, like you are mostly atm.
Just make the casual raid a bit tougher (not necessarily the mechanics, just a higher gear check) and maybe give us only a greed option and it should be balanced.