These things are simple fixes within the game that EA MMA already is.
-add different strike animations for different fight styles, and tweak speed/damage for each kind
-tweak the difficulty of submissions
-add some additional positions to ground game (posture-up half guard comes to mind)
-tweak damage in some of the ground positions.
It looks like THQ will need a whole new engine/game to make it not seem like your playing a video game version of rock em sock em robots.
EA MMA was far more like rock em sock em robots.
Simply throwing repeated left hooks and right hands was enough alone to drop your opponent in seconds.
In 2009 the striking was very technical and skillful, and in 2010 it didn't exist.