We don't need to sign WC players, we just need a structure and a style of play. How many WC players do Ajax have and look how well they're doing.
I know FootyGirl, my point was that we could not be able to attract top talents/players.
For example, if we lose De Gea, goalkeepers like Oblak wouldn't be interested in joining us. Same could happen with players like De Ligt, Sancho, among others.
I agree with you that the most important thing is a solid structure and a defined style of play. We don't need WC players, but if we sell Pogba, I would prefer a top player like Eriksen to replace him or a goalscoring midfielder like Fernandes.
IMO we need a proper replacement for Matic, maybe with the style of play you mentioned he can improve, but being honest, I think we already need a new CDM. Also, I would like to give an opportunity for our younger players like Tuanzebe.
I would be happy if we are able to get Wan Bissaka, Van der Beek, Tielemans, Sancho, Felix, etc. But now, I think they would prefer to sign for Juventus, PSG, City. Bayern, Chelsea, etc. if they have the chance.
I hope you are right and our current players could massively improve with a structure and style of play.