If Arthur was signed, there is a lot of promise there in terms of the future. A lot of players with plenty of years left in them and ones ready to burst through. Ter Stegen, Umtiti, Mina, Sergi Roberto, Semedo, Dembele, Arthur, Aleña, Arnaiz, Cucurella, @Fusion...
Coutinho is still young as well and Messi gets better with age. Think of what the Argentine will be like when he's 40?