I think the Real Madrid option for Xabi is too early. I think he needs to prove himself a little more. He can stay at Bayer Leverkusen for another year or consider the Liverpool option. I think Xabi can be successful in both options. If Xabi leaves the team at the end of the year, other big teams in Europe can easily make offers to the Leverkusen players who made history this year. They even transfer them. But if Xabi stays for 1 more year, I don't think the players will want to leave. They owe Xabi a debt and I think they need to pay these debts.
I agree with you, I think Xabi needs one more year with Bayer Leverkusen to get a more respectable position. However, according to media reports, Bayern Munich are interested in signing him. Bayern Munich will part ways with Thomas Tuchel at the end of the season. They need a technical director and I'm sure they will also want to weaken their opponents as they always do. If they insist on Xabi Alonso they can finish this transfer, there are very few who can say no to them.