The Wallachian state is annexed by Hungary and the morale of the people in the Wallachian kingdom decrease. Later, the Wallachian state wouldn't expand and finally, the Romanians [Wallachians] would hate Hungary more and support the Ottomans when they come in the 1450s or so. The Hungarians in the meantime expand to the Black Sea afterwards and won't lose many troops and nobles, the priest following Charles Robert and the Voivode of Transylvania. And no tense relations between Hungary and the Wallachia principality and no rebuilding of the Hungarian army and conflict with the Holy Roman Empire.
However, given the plans for the battle, this looks rather unlikely.