“If I had asked people what they wanted, they would have said faster horses.” — H. Ford
Yes, there are question as to whether Henry Ford actually ever uttered those words or not. That’s not my area of expertise, so I won’t argue either side. I’m more interested in the idea of not listening to the (actual or potential) customers. Also, it’s worth reading this post by P. Vlaskovits on the topic, to see how you should understand your customers.