WI Kara Mustafa does not attack Vienna (or dies before he can do so). Austria is sufficiently preoccupied with Louis XIV that she is unlikely to attack Turkey for at least a generation, and will have other fish to fry even after that. So it could be several generations later before Austria conquers Hungary from them.
Population growth in Hungary seems to have been very slow under Ottoman rule, so when it is finally acquired, the Magyar element in the Habsburg realm will be appreciably smaller relative to the German. German settlers will be a correspondingly greater percentage of Hungary's population, and could be even a majority in much of it. When the Hungarian Parliament abandons Latin in the 1840s, it may switch to German rather than to Magyar.