Obito's haste will have its repercussions, heed my words. If Madara would have been the jyuubi's jinchuriki, it would be much more decisive, and dangerous, because, unlike Obito who executes under emotional influence, when seeing fit; Madara always thinks ten steps ahead, before executing any major act, and he also studies the techniques on a level on par with Kabuto/Oro. And it would be the most devastating arc witnessed in Narutoverse. Even Obito doesn't know about Infinite Tsukuyomi, in detail, nor do we. The only one, who can foresee the future is Madara himself.