The change of coach may make the team unstable at this time but I think it will only be a short-term challenge before they recruit a new coach, their previous coach managed to optimize every ability that the players have including young players as done by Klopp and also Edin Terzic, but we don't see that happening when Nuri Sain coaches, Even though we know , if their has been relying on the sale of young players to continue to provide stability to their finances, I think current their must able to get a coach who have tactical skills, strategy and also develop the talent of young players, so that they can still compete with other teams in the Bundesliga while also still being able to orbit talented young players who will be the source of the club income later.
It could even be more than that in my opinion, because after all a new coach needs time to adapt and maybe it is a long time for them to really understand the character of each player they have. But I hope Borussia Dortmund can be very lucky to be able to get a coach who can immediately show something positive, although I feel that it is also unlikely to happen. However, if they fail with their new coach, I also hope they don't decide too quickly to bring in a new coach. At least they also have to see how the process can be done, after all what is happening now I think is because of their own actions.