The fact that Dortmund is at 10th place, is enough to fire Nuri Sahin to be fair. I am not really interested in any excuses or anything, Dortmund is not the type of team that should be getting anything good, we should be seeing how they are better. Think about it, this team was last years UCL finalists, and right now they are 10th on their league, that's just not acceptable at all. It was high time that they made a change and I understand why as well.
The biggest issue is, if the problem is not with Nuri Sahin and if anything is wrong with the players, then things could get a bit worse. If the players are the reason, then getting a new head coach won't make a big difference at all, it is just going to be something that will keep being a problem.
Seriously, I also don't think that Nuri Sahin should continue coaching Dortmund again with this kind of performance. It has put Dortmund in a terrible position currently. Dortmund's performances are getting worse, and if they continue like this, they may not end up in a good position on the Bundesliga table. Fans may not be happy, and it could even make them lose some fans.
I can't imagine that Dortmund, a team that has been occupying the top four almost every season, is in this position now. This is very bad. I am just surprised at how Dortmund's form has dropped this season. They played really well last season, especially in the Champions League, but look at what they are playing recently, even in the Champions League.
This season, Dortmund was among the teams I was predicting to fight for the Bundesliga, but see where they are now. In fact, it is only luck that can make them qualify for next season's Champions League.