Real Madrid can now do without Vinicius Jr because they've the necessary player for the club's growth. Madrid president, Florentino Pérez will go for the best stars in the transfer market. He will always do anything to ensure he's sealing the big moves, no time to be relentint because he needs to bring back the glory days in Santiago Bernabéu.
Vinicius Jr no longer seen as the standing pillar in the club? I don't think so, he's just having some rough time but he will definitely bounce back to winning streaks, he just have to make sure he's on the right path and making efforts to bounce back to limelight. Perhaps the new coach, Xabi Alonso will enchance matters and make things a little bit smooth for the Brazilian.
I read this like three times but it sounds to me as if you're contradicting yourself. In the first paragraph, you said Real Madrid can do without Vinicius Jr because the Madrid president is going for the star players to bring back the old glory to Santiago Bernabeu and in your second paragraph, you admit Vinicius Jr is the pillar of the team but just going through a tough time that requires time for Brazilian to bounce back.
Well, wether Vinicius Jr is a pillar for Real Madrid squad or not, he's just a player like any other players and he can choose to stay or leave the club at the end of his contract but the club will remain as if nothing happens. Messi depart Barcelona and heaven did not fall. Ronaldo left Manchester United and the team still remains. I can go on to mention but it's not necessary. Saudi is showing interest in the Brazilian forward already and there's nothing to be worried about even if the deal comes to pass.