Barcelona can still get him next season if they want him, but Hensi Flick once said that they are also good without him, that they have good players that can play in his position and his team will do everything fine even without him; this statement was after the deal collapsed before the beginning of the season.
Nico Williams is a good playmaker, he has potential just like Lamin Yamal of Barcelona, and if two of them happened to be in the same team, they will play well because their bond is strong, and they seem to understand each other.
Nico is making this statement to save his position, and not to make it look obvious that he is desperate to leave the team, but we all know that he has dream to play for either Barcelona or Madrid which I believe will happen some days it's just a matter of time.
I never thought this deal was going to collapse because everything was just going smoothly. He has Lamine Yamal his close friend and countryman in that team already, moving to a team like Barcelona is something he would be proud of and will like to play to his best when he joins the team. I didn’t know how the deal got collapsed after the so many green lights in that deal that it’s going work out. From the statement above said to be released by Hansi Flick after the deal collapsed, it doesn’t seem to me like he meant them, he might have just said that out of anger of the deal not going through.
If another opportunity arise for them to bring him in again, I don’t think they’ll hesitate not to push for him. Nico Williams is a very young and talented player that Barcelona if gotten in that frontline will make their game more interesting, the other players he said that can play like him are on left than him and in no time may become useless to be productive again. This is where Real Madrid is always one step ahead of them, they get young players and invest in them for long time. Barcelona should also learn to inculcate that if they want to go far in the league every season.