He would have eventually died like Hashirama did in the wars. If whoever Hashirama died to was strong enough to kill him, Madara would have been killed too.
If Madara was Hokage Naruto might not have been born as he has Sharingan to control bijuu thus prohibiting Kushina to be brought to Konoha as a vessel and not meeting Minato.........I think
If Madara was Hokage Naruto might not have been born as he has Sharingan to control bijuu thus prohibiting Kushina to be brought to Konoha as a vessel and not meeting Minato.........I think