It was never Togashi's idea to end it so soon. The man happened to be too sick to finish YYH properly so he came up with a way to end the final arc early. Not that manga authors have any control over how long their animes end up being.
I'm still sad that I never got to see the silly face that Kurama made. It was only implied. XD
Nah but there's probably a look alike running around. The cast looks wise makes an easy comparison to YYH counter parts though.