Imagine their characters together in a 3d Combat game beating the crap out of each other.
Yeah, someone went out and made one.
It's a surprisingly high quality doujin game that even supports up to 4 people in online play going head to head with each other. The character voices obviously aren't done by the original cast, but they sound pretty close, and they've put in a good deal of each character's defining abiities.
Here's random screencaps of a 4 way free-for-all

Good old Divine Buster

Sakura is being "befriended"

Staaarrrrliiigghhtttttt... <you finish it for me>
Yeah... anyone else here play it?