I wouldn't be surprised if it becomes impossible to even use cash in the Netherlands soon enough. The first year I was here I don't think I did even once. I've been using cash a lot more lately just out of principle and it's annoying - lots of pin-only check out lines, etc.
Laws would need to be changed for that to happen, so don't expect it anytime soon. Also, cash is kind of the one remaining option when there's no electricity. So for disaster planning people have been asked to keep an amount of cash around. With recent developments in European security, the need for this has become all the more clear.