I still agree with Tsumoto Yo's point that Japan would be different if Nobunaga did not perish in 1582. Just before his death, he gave orders for his son Nobutaka to invade Shikoku. Even more bizarre, he already gave provinces away as if he already won the invasion. A key area for shipping and a place for the Oda Navy. Nobunaga was in good terms with the Date in northern Honshu and the Shimazu in southern Kyushu. He did not have to fight them at the moment. The Hojo were an ally by default, war against the Takeda. The Mori were still strong, but not as aggressive in the past. One of the main reasons why he sent Hideyoshi to attack the Mori before his death. The Uesugi were still worthy as well. However, the house was in turmoil after Kenshin's death in 1578. Nobunaga had more geographical and human resources than the Uesugi. It would be a matter of time before they would fall. Nobunaga as shogun? Who knows. Then again, Nobunaga was clearly an independent man who defied all who was against him.
Tenka no Tame!