I would also route for Real Madrid to be title winners but looking that Xavi is off the Champions League and doesn't have pretty chances in the English Premier League, it seems that it is only the Laliga that is his major target.
He could surprise everyone of us in order to prove his abilities.
Lalagi is the most realistic target for Xavi this season after failing in the Champions League. But not only Laliga, Xavi also needs to set high targets in the Europa League and Copa Del Rey where they currently still have a chance to win it. I wouldn't be surprised if Xavi succeeded because I think Xavi and Barcelona really deserve to prove that.
In the past season, with half of a season, Xavi brought Barcelona to a runner-up position so it is acceptable to require him a titale in this season. Even it is a challenging requirement, it should exist to motivate Xavi and Barcelona players.
They still lack of some important factors but they have one advantage against Real Madrid. They are no longer playing in Champions League that gives them more focus on La Liga. Though I agree Real Madrid are stronger and more experienced from players to coach, I think Barcelona have advantage then chance to win La Liga.
I completely agree with your analysis of Barcelona's chances, but I really find it difficult to expect Real Madrid to let him go because of the rivalry of the two teams. Xavi needs to make Laliga their top priority this season although I also hope the Europa League comes second. But I feel the Barcelona players need more experience in dealing with competition because some of them are very young.
I'm sure Xavi will give everything for Barcelona right now, but of course it will never be easy for them to achieve their dreams because every team will be very competitive for points. Next Barcelona will have a trip to Wanda Metropolitano, I believe it will definitely be more difficult.