I'm very sure with this pattern I don't think Dortmund will be able to win any trophy because giving out their best player means it is impossible for them to have a better squad. If Dortmund must win trophy they should be able to package the best players in order to win a trophy. This haa always been the pattern of Dortmund and it normally ends up with the same results.
In fact it was not bringing out the best players, but rather cashing in on the best players by selling them to other teams so that Dortmund's achievements could only come close to those of Bayern Munich. But it will not pass Bayern Munich as long as Dortmund still prefer to release their best players to other teams who then go back to print other players to be better. However, I prefer that next season Dortmund can compete better in order to win a trophy in the Bundesliga, because for the UCL trophy it seems that it is still a bit difficult for Dortmund to achieve.
While it is true that Dortmund approach of offloading their finest players has prevented them from matching Bayern Munich accomplishments it is crucial to take the club long term objectives and financial stability into account. Dortmund has continually shown their capacity to foster and develop emerging talents ultimately paving the path for future success even though it may be upsetting to see important players leave. It is good that you want Dortmund to play better next year and win the Bundesliga crown. Dortmund may find it more difficult to win the UCL title in the Champions League but with the proper combination of quality strategy and tenacity it is still possible. Although the road to success may not be easy Dortmund dedication to their concept and the tenacity of their team give optimism for greatness in the future.