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This might still be a strategy to get him resigned, However, It is a good thing that he resigned the job than to get sacked by the Barcelona management board ,However, in my opinion Xavi stay at Barcelona hasn't yielded much of result so far, that is to try to bring back Barcelona to its usual glory, therefore it is right time they give another manager chance to try to fix things up with the Barcelona team.
Instead of being fired, Xavi would be better off resigning, I think that is an inaccurate assumption about Xavi.
Xavi has given his best for Barcelona amidst Barcelona's very poor financial condition. Last season he managed to win two titles for Barcelona, while this season Xavi managed to bring Barcelona to compete in the Champions League quarter-finals. This is a respectable improvement for Xavi, I say that because of the current condition of the Barcelona squad which is filled with loan players and academy players.
It's not easy to be Barcelona coach, even when they have good finances. Of course there are higher demands from him, but that is not logical considering that Xavi has difficulty building his squad without strong financial support. Unlike Real Madrid and Atletico Madrid, these two teams tend to have good financial strength.