This is, what I think, the Barcelona in 'Post Messi' times should look like.
Dybala could add the creative part in the attack while being supported by Fati and Trincao, who bring either speed or creativity themselves.
After the arrival of Ronald Koeman, I think it is likely, that he will purchase Donny van de Beek. He could be the main man of the midfield to support the attack, while Puig and de Jong are managing the transition between defence and attack.
Cucurella and Semedo/Dest are quick running down the flanks, which could also add a lot to our attack. They only have to work on their defensive abilities and they would be suitable for Barca, in my opinion.
The french partnership pairing of Lenglet-Upamecano would be rock solid, while having extremely promising youngsters coming through with Garcia, Araujo and Todibo. I think Garcia should be in Lenglet's place after a few years.
Ter Stegen would be our number one, while Inaki Pena could act as our second goalkeeper, while surely having the potential to be that.