Let's just take good care of Alves, reduce his playing time and still use him for 1-2 seasons (it would be awesome if we could get two more seasons from him after this one, if he wants to stay of course). Then we'll need to play without a player of Alves' class (like we did without Xavi), cause there's no way in hell we'll find another Dani in this market. Good part is that with the RBs of today, Alves could be top 3 in his position at 35, Maldini style.
I mean, if Bellerin is considered great because he can run pretty fast... then... nothing can be added really. Dani Alves has twice the footballing IQ of Bellerin.
He's young though, I give him that. For 25-30m he might be a good transfer.