Bayern Munich now have a problem, it will be competitive enough to make the ones serious. Bayer Leverkusen greased the entire competitive race for them to be smooth and free up from the shackles of defeats. That's exactly what a good coach brings to the table, he knows when to divert and go in search of new formation for his team. Always play major role as the front-runner of the club, Xabi Alonso deserves all the accolades he could possibly lay hands on them.
Xabi Alonso gives the maximum benefit that can be given to a team. Bayer Leverkusen became a good team with him. His players are currently taking the world by storm. Xabi created the players that every team wants to see in their team. That was the most difficult thing. Xabi achieved it and Bayern Munich wants to reach a better level with the new coach. I am afraid that if they do not achieve this, there will be no trace of Bayern's old dominance.
Bayern may not be as dominant as they used to be, but they are still Bayern and it would require a lot more than just losing a few times than make them be bad. Remember, Bayern didn't always win the title before their big run neither, and yet they were always at high levels, they weren't a bad team before that run neither, and they won here and there.
What made them so great is that they are managed very well, meaning that financially speaking they have a system that allows them to keep being a good team, even if they suck for a while, the economy they have would allow them to make sure that they get back on the top eventually.
I can guarantee you that even if they do not win it this year, which is a big if, then they will win it some time soon anyway. This is why what Leverkusen is doing could be considered harder, they have a lower chance, because they have Xabi and a good team now, but in five years none of them will be there and they will not be a good team at all, they do not have the economy that Bayern has, and that is why it's a lot harder situation without a doubt. I think it's clear that we are going to be seeing Leverkusen have a short sting, while Bayern will keep being great.