Certainly most of us on HN have the ability to work jobs where we earn enough to save money - whether we have the discipline to do so is, of course a different matter. Wage slaves were commonly paid wages such that there was absolutely no way for them to leave their job even for a few hours to try and do something else.
Today's economic systems, in the west, make wage slavery practically impossible.
That's a little misguided. For the uneducated, the mentally or physically disabled, or the financially burdened "wage slavery" can easily become the reality.
It takes being at a certain level in society to realize that you can create value in a way that is both competitive and creates a stronger bargaining position. It takes a level of understanding and confidence to do this that many people lack.