The Sengoku Jidai is delayed but not by much. The Ashikaga were extremely weak by this point, never really recovering from the aborted Kenmu Restoration. By the early 1400s, the Sengoku (or something similar) is near inevitable. Pretty much every viable method of taxation was in the hands of Daimyo, rather than the Bakufu. It's a question of "Who and When" rather than "If and How" when it comes to rebellion.