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I was actually disappointed at Bayern Munic for loosing to Mainz but as it is football, such things happens to male the sports interesting and full of surprises. On the other hand, I love the energy with which they bounced back by humiliating RB Leipzig with 5:0. This results shows that Bayern Munic losing to Mainz might actually be a mistake, although, it is a costly mistake. Bayern Munic have good opportunity to win the German Bundesliga this season even though they still have many teams to contend with.
I was not expecting at all to see Mainz win the game against Bayern Munich and they were not strong enough atall to beat a team like Bayern Munich. I think many people were predicting to see Mainz lose this match and they were predcitig to see a draw but there were a few people they are hoping to see Mainz win this match while theywon it with a 2-1 result.
Now there is only four points gap between Bayern Munich and Leverkusen which can give them a much higher chance.
I doubt there will be anyone who expected Mainz to win Bayern Munic unless those using supernatural powers, if they actually exit, and possibly the fans of Mainz, who will always remain optimistic despite the fact that they are playing with a team that can win them. I guess their optimism worked and that will be celebrated in no mean way.
Bayern Leverkusen may be the people to benefit from the loss of Bayern Munic because it will enable them to catch up on them. Like you said, seven points gap have been reduced to four points gap which means that if Bayern Munic loses two more matches, Bayern Leverkusen may be on their way to retaining their title.