If there was no miracle of Brandenburg, and Prussia gets crushed in the Seven Years War, Austria would regain Silesia and likely would have been successful in later attempts to annex Bavaria in the following decades.
In such a situation, how plausible is it that Austria wins out in the internal struggles with Hungary? During a Hungarian revolt, could they have broken the power of the Hungarian Kingdom, dividing it up into smaller principalities? Could they have flooded it with more German settlers to the major cities, eventually leading to German becoming the primary language?