Zero chance of actually happening.

RPS serves several purposes in the way that it plays and is.
It is simple, quick and easily comprehensible to the largest number of players. It is there to strengthen the co-op aspect of the game, which is the main design aspect of the game.

It is there so you can argue with each other in an internally supported way.
While it is variable and diverse enough not to fall into routine.

Short of someone modding it in...