Street Fighter vs. Mortal Kombat

I've been scouring for video online for the past few minutes, and among the various videos I've watched (which included -- no point in lying -- some pornography, a Star Trek vs. Star Wars thing ... oh, and the Daniel Pearl beheading), I checked out a few little mock ups for Street Fighter vs. Mortal Kombat. Now, most of what I've seen has been some combination of Ryu and/or Ken fighting Scorpion and/or Sub-Zero, but in all, a legit confrontation between the two franchises ... well, that would give Capcom and Midway a license to just print money.

So, what would it take to get the two franchises to coexist on a combo title, like "Capcom vs. Marvel" and the like? Would it be easier/better marketed in 3D format (marking Street Fighter's first foray into that fighting style), or would a return to the 2D fully-rendered characters of Mortal Kombats 1-3 be a better sell?

Me, I think a Shao Khan vs. M. Bison match would be hardcore, Liu Kang makes a much better foil for Ryu than Scorpion (as some folks seem to think), and Blanka vs. Barraka would end in all kinds of major bloodshed ... as well it should.