As Mrpaxing and surfside mentioned the current system is far from perfect and it never hurts to look at new systems.
However,as I said with company super schemes the new plan or bid system will rarely be better than the current one.Otherwise the company would have no interest in it.
You can try to have safeguards in place and I guess their success depends on the industrial situation and that depends on who is in Government.
As I said I know of 2 girls who voted for the bid system in 88 and just after that when we were turned around on a trip they said in disbelief "But the company said they would never do this"...
If there is a moral to be learned from that is that the company has no morals.