Imagine Alonso repeating the same thing by making it difficult for Bayern Munich, I think that would be the end because it only shows that Munich have lost that strength of getting back that glory and Leverkusen is a worthy champions but I can't say it will because even Dortmund are also getting ready to over shine Bayern Munich and the current Champions Bayer Leverkusen.
In Serie A I think is something that always happens when a team win the title they become useless the next season with a very poor performance and you'd be tempted to ask if this was the team that won the league or is there something wrong somewhere? I think is only when Juventus was in their prime that they won their league title severally without doing bad the next season but for Bundesliga I think it will be a different show, Bayer Leverkusen can still retain the title, even if they don't I believe they won't play very bad like Napoli did in the Serie A.
The season hasn't started yet but I'd say as per my prediction that if Bayern Munich don't play according to plan then Bayer Leverkusen will have a chance to advance.
The beginning of the season is very important for every team, if the teams do not perform well in the beginning then they cannot close the points gap later on and come to the top of the points table.