I have watched the youtuber Brainsforbreakfast's very entertaining video 'the rise and fall and rise and fall and rise of Germany'. In this he brings up reasons why it was Prussia and not Austria which united Germany.
One of the reasons he lists is the fact that the Danube, flowing through Vienna, directed Austria eastwards and away from Germany. For a while however, Vienna wasn't the Austrian, Prague was. And through Prague flows the Vltava, which runs into the Elbe, right in the middle of Germany.
So what if Prague remained the Austrian capitol? Will Austria be able to direct more power into Germany, maybe even eventually uniting it? Or will it just lead to Austrias eastern lands being even harder to control?