With the discs turning faster than the wheel they MAY just cancel out the gyroscopic effect of the wheel and make the steering constant effort (although I'm not sure that I'd want lightweight super sensitive steering when I turned in to a very fast sweeper - I think that the weighting of the steering helps here).
But they've got to add to the unsprung weight of the wheel and largely negate any perceived advantage of steering effort by making the wheel less able to track over the road and harder for the suspension to control.
So on balance, I think I would prefer to stick with lighter wheels to ease steering and reduce unsprung weight.
To be honest, I think these will go down with hub centre steering as a good idea in theory but too complex in practice.
Mind you, hub centred steering AND reverse discs now there's a thought
