When you see Barca bringing through the likes of Iniesta, Xavi, Fabregas, Pique, Busquets, Messi, etc... it has to be possible to do it here too. It just depends on how committed the club are to achieving success that way.
Barca have a considerable advantage in that La Liga contains a number of dead rubber teams who they could play their u-12 team against and still win by double digits.