The war ended with the victory of the shinobi forces, thanks to the effort of Naruto Uzumaki and Sasuke Uchiha for the most part, however, there were countless people who died, and some of them were major characters in the story.
Following the events of the Fourth Shinobi World War, the allied shinobi nations took a step to strengthen their bonds. They formed the Shinobi Union, which is almost an equivalent of the real world United Nations.
The most likely option to become Eighth Hokage would be Konohamaru Sarutobi. Like Boruto, Konohamaru is a ninja with Hokage blood in his veins, thanks to his grandfather, the Third.