Well, let's wait till Xavi and Iniesta are too old to play and then we'll see if the success will endure with the newmy old friends.
Look at England, few good clubs, mainly cuz of foreign players on the shopping list. Same goes for Barca and Real M...
Strong leagues cuz of the shopping cart and less caused by their own players.
And I am no expert but I think Italian and German league are less depending on those kind of players. Well, Bayern München does the same but who likes those anyway? ;)