Firstly, I am not sure that Pep Guardiola would have returned to Barcelona in its current state. Guardiola is already used to working with clubs that have high ambitions and these ambitions are backed up by a good financial condition. With all due respect, the current Barcelona, with all its problems, hardly fits this definition. Barcelona now needs an anti-crisis manager in the current difficult conditions and Guardiola does not have serious experience working in such conditions without any guarantee of a successful outcome. The club's management is also unlikely to bring such guarantees, so there is hope for the arrival of Xavi. Another question is that Javi does not have such experience either and there is a serious chance to ruin his coaching career. Therefore, many questions remain.
I don't think any coach can help Barcelona at the moment.
Barcelona is in a big financial and organizational crisis and needs urgent changes, and financial help from a new sponsor.
This is not something the coach can handle but the club management.
Barcelona must give up its big ambitions and focus for the next few years on saving the club financially and preventing the club's bankruptcy.
If the club's management asks the new coach for results, while the club is currently in chaos, this will not be possible and any coach will simply burn out in these impossible circumstances, including Xavi.
The current reality of Barcelona is that this season they are far from titles in both the Spanish Championship and the Champions League, and the club's management will have to understand this as soon as possible and dedicate themselves to saving the club and the future of the club.
Barcelona is in a very difficult situation, not only this is about the money, even if they sold all their good players for a good price if the results begin to be incredibly poor then they are going to lose the international fans and they will be left only with the local fans which are not going to be enough for them to rebuild their team and finances, so they need to somehow raise their income substantially while also keeping the costs low while not suffering as much on the field, something incredibly difficult to do.