Dortmund focusing on business is helping them make lots s of profits for the owners of the club and they just want to continue in that way because they can not be competing with Bayern Munich for the title. Bayern Munich will always be favourite to win and just in one blue moon will other club have the chance to winning hence just focusing in the business side of football is happening Dortmund stay relevent. Dortmund has what it takes to become champions in any league they compete at but they are making more money firm selling players than they'll make form winning trophies. Leverkusen aren't going to be favourites again, they just had one good season hence they should also focus on selling their top players and make profits before the players market value reduces. If it was Dortmund that won the league last season, they would had sold almost all the star players of last season.
Bayer chose a different path, they decided to keep the team together and try to win the Bundesliga again, and also try what they are capable of in the Champions League, but I think the number one task for Alonso this season is to defend the championship title.
As for Dortmund, I doubt that they could win all the tournaments so easily, it is much more difficult than it seems, even the strongest teams like Bayern or City cannot do this, and Dortmund has never been one of the strongest, so it is even more difficult for them and maybe that is why they chose a different path, when you do not strive to be the best team, but have a very good financial situation and sometimes hope to reach the Champions League final as it was recently, or fight for victory in the Bundesliga, when everything was decided in the last round and everything was in the hands of Dortmund, but apparently the team is simply not ready for great victories.