I would argue Bayern are due a loss. They are currently on seven in a row, which is - of course - an all-time record in Germany, maybe even Europe. A Bayern team which is far away from being as good as some previous great Bayern sides. And not only this season, this has been true for a few years now.
IMO, this feat is possible for such a squad mostly due to the fact that Bundesliga declined considerably over the past decade, similar to Serie A up until recently.
Most of the time they lose the title after a few years, then they go buy a key player from the side (Dortmund mostly) that beat them and win it back the year after, while the other team fails to maintain the previous campaign's form.
This year however, you have Dortmund and Leipzig (who won't sit idle, knowing Red Bulls strategy in any sport: invest until you're the best) which will probably be back stronger. While Bayern invested heavily in defense already, they are also in need of an offensive rebuild, maybe a midfielder, which won't all be possible this summer.
They're in a similar situation to us, actually