A lot need to change imo. Not for La Liga, where we will compete every year probably. But for CL.
In order of importance.
1) Get rid of Valverde and bring in a winner and a leader to manage us. A fish rots from the head down. There are two heads in this case. Valverde and Bartomeu. These two are the main responsible for the CL fiasco in the last 2 years.
2) Midfield needs fresh blood badly. Rakitic needs to go, Busi needs to be a squad player and not a sure starter. Arthur and De Jong should play the majority of matches. They are the fresh blood that is needed. Maybe bring in a new player as well.
3) Suarez and Messi don't defend. They fail the team time and time again when the opponent is pressing us hard. Suarez needs to play less. Bring in a new forward instead of him who will challenge for the forward position.
4) Sign De Ligt and a forward.
I agree with your post 100%. Till Bartomeu and Valverde are here, we have no chance to rebuild the team.
It is time to move Messi to the middle, as a main play-maker. In order to do that, Bartomeu has to stop his pursuit of the over-rated and expensive Neymar and sign instead the French right wing Nicolas Pepe from Lille. That will solve a lots of the problems we have at the moment.
Ter Stegen
Semedo, Pique, Lenglet, Alba
Arthur, Messi, De Jong
Pepe, Griezmann, Dembele
Personaly, I would like to see a new centre back and move Gerard to the bench, but De Ligt is not a option. Most likely he will sign with Juventus. But there are many other quality players for that position. Bartomeu has to start looking around, instead of waiting only for Neymar. The time is running.