We see good performance from Leverkusen during this season but that's not a good reason to say Bayern Munich is not going to win the Bundesliga title anymore, Bayern Munich is a team with experienced and expensive players like Harry Kane in their team, and that usually has many better chance than all other teams in the Bundesliga. I even think Leverkusen will lose their place soon in the table to Bayern Munich.
I very much agree with your opinion. Even though Leverkusen currently leads the standings, we can see that Munich has a winning mentality and is a good team. You can see last season where they ultimately became champions even though they had the same number of points as Dortmund. Leverkusen has played quite solidly this season, but for me the presence of a world-class striker will really have a big influence on the team's consistency in playing in the League.
However that seems to be true as bayern munchen do have the ability to get back on top of the bundes league table with their experience and winning mentality so far bayern munchen have been in the league, yes like before when dortmund were fierce competitors of bayern munchen, and were almost beaten by dortmund, but got back, thus getting the bundes league trophy again.
But Xabi Alonso has a great opportunity this time and the chances he can achieve this season are also great, he must take advantage of the transfer market in January to strengthen his team and beat Bayern Munich, this is a tough mission, but if Leverkusen can compete and be consistent with his abilities he can win the Bundes League this season.