I guess THX was half joking when he said that they should make it 3D so they can have fatalities.
by that, I think he meant that if SF is in 3-D, it will likely be a failure, and the gameplay might not be as good as the 2-D version that we used to love about SF back in the days. I guess Capcom isn\'t known for making 3-D fighting games, and trying to transition an original 2-D fighting games to 3-D and still make it as enjoyable or better than what the 2D SF was like would be a very difficult thing to pull-off.
So, basically, what THX was trying to say was, if SF4 is made in 3D, it will be fatality to the game itself.