I might have been unclear, the question wasn't entirely rhetorical. In my experience "more flexibility" generally leads to weakening of labour rights, more part time, more time limited contracts -- and more of the things featured in the above comment.

In short, in a buyers market (employers purchasing wage labour) -- without regulation, the buyers hold all the keys (starve or work - that's not a choice).

If you have any examples of de-regulation of a labour market benefiting the majority of the population over say a ten or twenty year period, I'd love to hear about it.