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I am happy that Barcelona talked to Xavi and he wants to stay for next season, I know some Barcelona fans won’t like it because they believe Xavi is the problem of Barcelona, every Barcelona fan who thinks Xavi is not a good coach did not know anything about football, last season it was the first time Xavi come to the team Barcelona win the league and this season Barcelona is in the second position of the league everyone is complaining, Real Madrid is the one standing second position last season and they didn’t complain, they even extend carlo ancelotti contract and now see the kind of performance that Real Madrid is playing currently.
It’s not good to always blame the manager for the player's performance on the field, it’s not every season that a team must win a trophy, to win a trophy is not easy, and I am very sure that Xavi is not the problem of Barcelona if Xavi has good players he will control them and win many trophies, many teams are giving their coaches a second chance to show their selves but Barcelona own wants to be different, thanks to the Barcelona president that make xavi stay because if they allow xavi to go, Barcelona will be worst than this next season.
I missed something important here and it turns out to be true what you said after reading your reply I was surprised that Xavi actually stayed at Barcelona for one more season and I haven't heard for sure why Xavi stayed but from my thoughts Xavi still has sympathy Barcelona is currently short of players and he is the only coach who really understands how Barcelona is at the moment and perhaps Xavi also feels that he is truly like a valuable diamond in Barcelona as a coach who is very smart in terms of rotating players.
but that's just my speculation and we may not yet know why Xavi survived and I hope someone can provide more precise information.
of course Ancelotti will stay longer with Real Madrid even though previously it was rumored that Ancelotti would leave Madrid when he failed to bring Madrid to get the UCL title and this season Ancelotti will be a little closer to success with Real Madrid to get the UCL title and of course Madrid will want Ancelotti hang in there.