Really? How can you look at this garbage and think this is a faithful representation of grappling in any way? You can backmount someone and they just get up with one quick transition and this applies to most positions in the game. There is also an artificial barrier on how long you can hold transition deny per position.
Undisputed 3 grappling has the same philosophy as UFC 4-5 clinch where you cannot maintain one position if the other player does not want to stay there. Also, Undisputed 3's grappling has such mechanical depth like flicking the stick to reverse transitions and a primitive form of grapple advantage because your transitions cannot be reversed if you time a transition after a blocked strike.
That being said, UFC 4-5 goes too far in the other direction where it is too easy to control specific positions (why is it always side control lol) with relatively little interaction. Like the other lads said, you cannot outright remove GA with how reliant the grappling is on it now to function. Right now, GA does not offer enough potential opportunities besides maintaining the same position. For instance, high GA could provide advantages to submissions the same way initiating them in different positions does. Perhaps even the posture up positions. For example, a guard posture up transition with GA could provide the transitions to half/side more regularly.
Naturally, it would have to be balanced so GA is less effective in maintaining the side control + hammerfist position of doom.