Even the white zetsu are not enchanced by Kabuto. I say Obito could forcefully stretch the war up till Kakashi, Guy, B and Naruto by manipulating the leaders of the great five shinobi nations. But it wouldn't last that long, as Kakashi, Shikaku, Inoichi, etc. would figure out Obito's war strategy at some point later. What's even worse is that Kakashi has a counter for Obito's MS, which makes it worse for him. He would get killed later by all the Naruto, Kakashi or someone.