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Unfortunately you are right, Barcelona still can't give Xavi a big salary, because their finances haven't improved yet. But Xavi isn't so greedy and he's a good guy yes. He is a Barcelona legend also currently already improving the quality of the Barcelona squad. Previously he also succeeded in lifting Barcelona from a bad condition, I mean before this season, and next season he can certainly continue to work very well again. Hopefully.
Xavi has brought big changes to Barcelona since his first season, but he hasn't been able to win a title. Xavi then managed to prove his impact in the second season by sealing two titles even though he failed in the Copa Del Rey and Champions League. So we might conclude that Xavi is the coach that Barcelona has needed all this time, but if Barcelona didn't have financial problems then of course Barcelona would be stronger under Xavi.
You can expect Xavi to be a more successful coach at Barcelona in the coming seasons, but of course he needs good time and financial support so he can build a more stable and stronger team. At the moment Xavi is having difficulties about finalizing plans for signing his players, that is because Barcelona's financial condition is not good.