Young players such as Yamal, Gavi and Pedri are a great advantage for Barcelona, which has a bad financial situation. If they sell them at the right prices, the club can become economically stronger. In addition, quality football players are constantly emerging from the infrastructure and by selling them, the club can earn additional income. Yamal is a good player, but I think it would be better for Barça if he brings a big transfer to the team.
Barcelona can plan to sell the players but I'm not really sure about this. The prices of these coins can raise, he must be interested to hold more to get a bigger amount of money. I'm not sure if Barcelona can have a stronger financial status if they succeed to sell Yamal, Gavi and Pedri. Barcelona management gets some money, but it won't be enough money to build again Barcelona.
Yamal is one of the most potential players of Barcelona. He is getting often to score goals now. I think Barcelona management will regret it if they sell Yamal and they only get some money that never fixed the financial problem of Barcelona. IMO, Barcelona management should change their mind to sell the young players.