It's tricky to describe my vision, but i'll give it a try. I think they should keep the general cartoon asthetic of ST (it would be better if it was MVC3's), but while having more "realistic" models and a color scheme similar to Injustice's (It'd fit better with MK as it's not as bright). Remove the Finish Him! the game would have to be rated T, and we all saw how cool T rated fatalitys were. It would be cool to keep babalitys and/or friendships, maybe "canceling" the last hit into the friendship motion would triger it instead of the winning pose, provided certain requirements are met. The announcer should be MK's. The key to the gameplay would be taking aspects from both, but making it feel as it's own separate game. Make it back to block, but give it dash cancels, chain combo, but MK's jugle's, give us a breaker and focus cancel. I'm just talking from the bat there, you have to play with things to test how it feels, but i bet you get the idea. I think it could be an amazing game, if done right. I know MK would have to give and adapt more, but only in what is asthetics and gimicks, in what is gameplay it could really be a mix of both while being completely different to either one of them. I'm not sure if we'll ever see it, nor even if i would like it if it did get made, but only the announcement of it would be SO MUCH HYPE, because even when it doesn't exist, it will always BE the ultimate fighting game cross-over.