I don't believe he'll be fired immediately. Xabi is a very successful coach, and if his Real Madrid career progresses normally, it could last a few years. Spain is a place he knows well, and he's a coach who's attuned to young players. I still remember what he did at Leverkusen. They didn't lose a single Bundesliga loss for an entire season and reached the UEL final. I have full confidence they'll do the same with Real.
I am very confident of Xabi Alonso doing well and performing good in the Real Madrid team, his is both a good player and a coach he have played in three LaLiga league and now coaching a Laliga team so I think he will perform were, he have a great and efficient players in his team which are capable of dominating both the Champions League and Laliga so if there should be any reason, fault or set back of him not winning any league this season it should be his fault because as I said he have good players on his team or squad, but I don't see any relevant reason of them sacking him because it is just his first season with the team, but I do hope he perform well with the Real Madrid team.