I am pretty much predicting that Kabuto's last desperate plan was to kill himself. By killing himself, the Edo Tensei's will reign on forever.
I have a crazy idea. If the Summons have unlimited energy/power, then Kabuto would order the Edo-Tensei's to kill him. Then he would be resurrected, with a indestructible body/immortality. No one would be able to control him.