Seems like it’ll be Xavi, with Sergi filling in in the interim.
Xavi will certainly know how a successful Barca should play, but if he has the leadership skills, coaching skills, and not least the players to make it happen, will be interesting. He’ll come in with a lot of goodwill and respect.
In a way, it’s a brave move by Xavi to take over a sinking ship, while on the other hand, it’s almost a no-lose situation, with a couple of really interesting young players to potentially build a new great team around in a couple of years.