Board Thread:Theories and Speculation/@comment-33186873-20171106153304/@comment-734582-20171116103729

AsianReaper wrote: Honestly I agree with @Thekillman. Kakashi was Hokage until Naruto was ready. But if Naruto wasn't ready, he'd likely stay in the position until a good candidate was ready, which would be Konohamaru. Yea. Seems to me that Kakashi didn't really want to be hokage, but simply did it as his duty. He seemed to be perfectly content to let Tsunade take over again, and the moment Naruto was ready he retired entirely (despite being just 40 or so).

After Minato's death, Hiruzen took back over for another 10 years or so just to wait for a good candidate. Itachi may have been that candidate (given all the comments about him), but circumstance prevented that. Tsunade was considered but couldn't be found, and Jiraiya was considered but he turned it down. Orochimaru was a candidate but turned down by Hiruzen.

So yea, i think it's entirely logical that Kakashi would stay on until a replacement could be found. While Sarada or Boruto may be candidates, it seems madness to make anyone hokage before their 20's. Konohameru is the grandson of a Hokage and the pupil of a Hokage, so he has all the requirements to become the 8th.