Since my original post on my idea is long gone now and talking about fatalities is going to be primo with MKD coming out next month, I figured I'd post it again. Yes, it's that good to me, but this time, I don't want you to come up with any specific fatality ideas related to it. I just want you to tell me if you think it's good.
Here it is: Variations. If it sounds simple, that's because it is. The idea is altering "base fatalities" so that you have a different version depending on which final button you press.
I'll use the same example [I think] I used last time. In MKDA, Scorpion's spearhead fatality was B,B,D,B, attack 4. Scorp shot the spear into the opponent's head and pulled the head off. What I'm suggesting has Scorpion slitting the opponent's throat with the spear, wrapping the spear around the opponent's head, and swinging the rope around in the air until the enemy's body flies away from the head. That's if you press B,B,D,B and attack 3. It goes on with different variations for the rest of the attack buttons and possibly the block button too.
Think about it. There are many possibilities here.