Seeing how bad we were without a properly functioning Xavi, don't you want to move away from that over-reliance? It's like Messi-dependencia. We depend on a single player for a job and when that player isn't present, the job can't be done. Easy way out would be to continuously look for replacements for that player but there's never a guarantee you'll find one with the same quality level or skillset. The smart long term option is to move away from relying on the specialist and work on improving as a collective.
Right now the entire team is in a dead-wood state because of our unbelievable over-reliance on specialist players. Busquets is the set pivot, Xavi is the set regista/orchestrator, Messi the set goalscorer, etc. If that cog is missing, the entire machine collapses. The perfect team is one where any single player can do the job of others with equal ability. That is a key factor of total football, it's not just about movement or passing. Obviously we can't have every player being exactly as good as the other in every single way (i.e no other player on the team would be as good a goalscorer as Messi) but we can spread the burden out over some players. That means not having a single designated goalscorer, not having a single pass master, not having a single strictly attacking fullback and another strictly defensive one. That creates proper team balance and less over-reliance on specific players and ultimately leads to the benefit of everyone.