Now I'm not a madara fan myself but I do like him though. But I just know that we didn't see the last of him. He couldn't have gone out so easily.
As I said, I also like Madara, but him going to be replaced with Kaguya as the main villain was a very likely possibility weeks ago. Still, people were all like "Nahhhh, not gonna happen, she is dead, that voice talking to Madara was his own inner voice" and nonsense like that.
That said, it's quite possible we will see him again, just not as the main/final villain.