This season Dortmund is still a team that every opponent must be wary of even though their orientation in business such as selling good players has not stopped at this time. However, considering that Dortmund can always produce other new players to be better, it can at least still give them good hope this season so it would be very reasonable if we put Dortmund in the league title race this season even though teams like Leverkusen must also be an important consideration for Bayern Munich and Dortmund this season.
I don't think Dortmund will be a fierce competitor in the Bundesliga title race this season, they have undergone a lot of changes and on the other hand Bundesliga teams like Leverkusen, Leipzig and also Bayern have improved much stronger, it is the opposite of Dortmund so I doubt a little that Dortmund will compete fiercely in the title race especially this season they have a new coach of course every new coach needs to adapt in building a team as well as for Dortmund's new coach this season.
All in all, it's going to be a tough competition in the Bundesliga this season. In other seasons we see two teams leading the fight for the title but this season bayan munich is doing well and they will be consistent whereas dotmund has started the season fresh and the other two teams you have mentioned the season will be full of competition. When local league tournaments are full of competition, it will be easier for other teams from that league to participate in major European tournaments to do well in major tournaments. Banyan Munich lost the title to Leverkusen last season and they will definitely want to win the title this season while Dortmund have not been doing well in the last few seasons and they are also likely to come back this season.