Xabi's obligation is that he can't let himself be passed over by his direct rival Barcelona, he already has a good team to do it, there are no more excuses ,he has to put the team the way he wants it, Everything depends on him, he has been given all the power to do it, so the pressure on Xabi now is very big, but I think he will achieve it.
This is what makes Xabi Alonso both dilemma and joy, because all the access needed to bring Real Madrid back to glory has been fully provided by the club, both every new player desired to form a strong squad and other support, of course this makes the pressure even heavier, the club does not want to see the process but demands instant results.
Real Madrid might not be in a rush like we think because they want Xabi Alonso to mange the club for long. However, that does not mean that if Xabi Alonso is not improving the team performance, they wouldn't look for someone else.
Xabi was able to make out something out of nothing in Leverkusen which is one of the main reasons why he was hired by Real Madrid, because they believe that with the set of players that is in the team, they will be successful overtime if Xabi Alonso uses his coaching skills and experience to work on the team.