Yes, Barcelona young stars can help the team go a long way in the La Liga before bringing up another young players to replace them when they becomes unavailable or worn out. I don’t know how long this their financial crises will take them, but they should not fail to build their young players too because it will help them in the long term.
Barcelona is yet to fully utilize their young stars a d that I think is really telling in their results because they seem to want to depend on the old players with whom they are already very much familiar with in a very long time through the league already if which wouldn't be really productive again to them in the nearest future, but if they have been able to train these young players to be able to represent rhem well they should have a better squad now.
Barcelona isn't lacking players or the kind of strength they would need to build strength for the team but they are lacking a flexible tactics which could help them quickly adjust to see how well to fit these young players in such that they will be properly groomed just like klop is doing with Liverpool, he's got a good tactical flexibility that allows young talents blend and hes now got a reliable second team but it's actually totally different with Barcelona as xavi wants to still achieve something new with the old players using same tactics and blaming it on the inability to bring in new players who could help the team out.
Barcelona will most likely get to suffer even worse condition when xavi finally exit by the end of the season because he's not even maturing players who could replace the old and the few he's trying to cope with he's not giving them the whole liberty they would need to bring out the best in them, the likes of Yamal and Felix , these are two vital and key players who could change the narrative at Barcelona if given the privilege enough.