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.
But that's something Barcelona wouldn't do if they didn't really feel compelled to sell their players. I think if that was their thinking then they would have done it a long time ago because in the previous few seasons also some of their star players like De Jong and Gavi were looked at by a lot of clubs and even the offers were quite large but with Xavi's characteristics where he only focused on incoming players and did not let any players leave it backfired on themselves.
Now if you look at the conditions next season if it is possible that there is a new coach then surely it will also follow the existing ones where they will not try to release their players unless it does not fit their attacking scheme.
Now there is another option where Lewa can also be sold to the SPL because it will benefit Barcelona if indeed they are ready to make a reshuffle but the current situation is uncertain for Barcelona because in the end we don't know who the new coach is and what steps he wants to take later.