So for the first half of the Thirty years' war (1618-35) the Habsburgs had more or less won against every opponent they faced. They beat the German Protestants, the Danish and the Swedish and seemed well on their way to victory when the French intervened. After that the war stalemated and became a dynastic conflict, an Italian wars 2.0. So lets say the French are unable to intervene in the war for whatever reason (the Huguenots do better at resisting the Royal government, an earlier Fronde uprising, a longer Anglo-French war, ex) and the war ends in the early or mid 1630s.
What are the long term effects of such a victory? A centralized Holy Roman Empire? The restoration of Catholicism as the dominant religion in Germany? A possible Spanish-Imperial reconquest of the Netherlands? A continuing Iberian union? Please discuss!