The snag with side sticks is training.
With the explosion in new 200 hours cadets straight onto an A320, it would make things a huge amount easier if there were moving side sticks so you could feel what forces were being put on at the earliest possible stage.
When you have more experienced crews, I think it is much less of an issue and the additional complexity and more to go wrong argument probably wins. The problem has been that our training is 200 hours then in the RHS, and for the first few hundred hours it's much more difficult for the RHS and LHS.