I've often seen it asserted on here that Bohemia, even before the Thirty Years War, was dominated by Germans and the German language-in one thread a few weeks ago (which I'm too lazy to find), it was suggested that a Bohemia ruled by Frederick of the Palatine and his descendants would have Germanized and been a candidate to unite Germany.
This has always seemed a bit off-base to me. IOTL, much of the (Czech) Hussite and Protestant population-and the great majority of the Czech nobility-were expelled following Austria's reconquest of Bohemia in the Thirty Years War, replaced by Germans loyal to the Austrian Emperor. Bohemia was part of the German-speaking Austrian empire, its government dominated by Germans. Even so, Czechs remained the majority and eventually regained political dominance, with Germans only around a fourth of the population before WWII.
So, my question-what was the situation of German in the crown of Bohemia (Bohemia+Moravia+Lusiatia+Silesia) before the start of the Thirty Years War? If Bohemia had escaped conquest by Austria and survived the war as an independent country, would it have been primarily German or primarily Czech?