To be honest, i don't really think that any team can really threaten Bayern Munich in the Bundesliga this year. I just don't see any team right now that is strong enough in the long run to really push Bayern Munich from it's throne in Germany. I agree though, that RB Leipzig is the second strongest team in Germany and if a team is able to beat Bayern for the Bundesliga title in the coming years, then i think it is Leipzig and not Dortmund. I already said, that Leipzig is stronger than the BVB even before the season started, because for me the business model of Borussia Dortmund is not good if you want to play for titles. They are buying new and talented players and then there are two options. They are developing great, then they will go to bigger clubs as it happened with Sancho, Dembele, Haaland and soon Bellingham. The second option is that they don't develop that well and then they stay at Dortmund.
For now, there is no 100% that can Threaten Bayern Munich from getting the championship but there is a close team that could maybe not now in the future and for me, that will be Leipzig right now Leipzig has to pull down the obstacles in getting into the 3rd position I know that they are now close rivals of Freiberg and they got a history as rivals on the DFB-Pokal and Leipzig have had a good win over Freiberg, but yeah I know that Bayern Munich despite Lewandowski is not in the team anymore they remain very agile with the wins because on the new members that they have,
They did not start the season, well. Or at least as well as there should have started. But now they have started performing well. Right now Bayern Munich is at the top of the table. And currently, it does not feel like there will be removed from the first place. I believe that even though Leipzig is a strong team in Bundesliga, they are nowhere near Bayern Munich in terms of strength and quality of the squad. I do not think that Bayern Munich will face too many problems against Leipzig.
As I have been saying they are not going to face too many problems in the Bundesliga. But they will certainly face some problems in the Champions League.
As I have said in my previous post Leipzig is really like this since the last season they will surely have a bad start but eventually get a hang of it in the midst of the season to certainly bring hell to lose to every team not including Bayern Munich because yeah they might be close to Bayern Munich with the standing but they are not near the quality of players and they don't have the resources that Bayern Munich have, Leipzig might get a poor beginning in opening the season but that will change when they got used to things in playing overall,