As long as the club is still comfortable with what it does each season and as long as many fans are quite happy with their current condition even though there are also many who demand that they do more then I think things like this will continue.
The conditions that Dortmund are doing are not just from one or two seasons but this kind of strategy has started when they were in the previous decade where Lewandowski was the opening for them to sell star players even to their own rival clubs.
So things like this will be difficult to change even if in the end there are several opportunities they want to take risks but when it is not in line with what is expected and actually makes them lose I think they will still return to their comfort zone by selling their star players for the club's financial benefits.
One thing I really like about them is that their supporters are very loyal to the club, even when Borussia Dortmund hasn't been able to give them what they expected, they are still loyal. I mean, usually when supporters demand something, they will protest to demand it, but I haven't seen that from their supporters.
Actually, they just need to raise their level just one notch from what they are showing now, then they will be able to achieve something that a club wants.
When talking about fan loyalty, it is true that Dortmund fans are one of the most loyal fans because even though they do want trophies as a form of their strength but they don't demand too much from club management to force themselves because they just like to accept what happens even for 1 decade they are always under Bayern.
An example of their loyalty was also seen at the end of last season where Signal Iduna Prak was filled with almost all fans of Dortmund and even it came out of the stadium in their last match against Mainz because they were preparing for the euphoria of the champions but failed in the last match instead of them getting angry and expressing frustration but instead they encouraged players who were slumping it was one of the craziest loyalties for a fan even though they must be difficult to accept the harsh reality where they must be willing to lose the trophy in the last match but they are still able to keep and protect players from getting too down because of their failure.