Well until you change the tax laws any such change is just going to result in a pay cut. The whole reason things like healthcare are offered as benefits rather than straight salary is because benefits are tax efficient.
>Ultimate flexibility is what efficient economies are about. Unions don't like that future and understandably try and fight it. It's a futile fight in the end.
Sure get rid of the unions, but let employers band together in trade associations. I am sure that these employer organisations would never collude to hold down wages.
Edit. It is good to see that everyone here has forgotten about all the big tech companies banding together to hold down tech wages.