It is true that it is very likely that football fans throughout Germany will support Dortmund in the UCL final, but facing Madrid in the final is not an easy thing, especially since Madrid is always the winner in every match in the UCL.
Tomorrow Dortmund will face Mainz, this is quite an important match for Dortmund, don't let Dortmund's main players get injured in this match, Terzic will definitely field Dortmund's reserve players in this match.
The match against Mainz appears to be important to them but then I think Dortmund will not risk their key players for the game because somehow they may not have much to loose from that game because it's not going to have much effect on their position on the table and how well they are going to end the season in the German bundesliga but then the champions league is such that they have to give their very best if they will be able to get a chance at it.
Mainz isn't a team that will actually get to be a problem to Dortmund that much because they aren't of equals strength with Dortmund especially if Dortmund wants to bring their champions league performance to their domestic league I don't think Mainz will even get to see a draw by the end of the game but then Dortmund will most definitely be channeling all their efforts into preparations for the finals of the champions league which they have been able to so far made it through to, Dortmund know that this isn't a season fort them in the bundealiga so they better Chanel their energy to where they think they have got a chance.
The whole of Germany is most definitely going to support Dortmund in the champions league finals because that's the only representation they have got in the champions league at this time this season so they would want to give them the support with the hope the trophy comas to Germany as it's gone to Spain more often then it has been to Germany and even some other football fans away from Dortmund fans are definitely going to be supporting Dortmund having been able to have gotten this far.