> I saw polls at the time showing over 50% of smartphone users said they wanted a physical keyboardThe key words being "said they wanted." It's not uncommon for there to be a big divergence between what people say they want, and what it turns out they actually want. Sometimes they just don't know what they really want until they see it. Sometimes they use the wrong words and say they want one thing but really want another. Sometimes they know how to express what they want, but feel it would be socially unacceptable to say it out loud, so they claim to want something else to avoid being the odd one out.
It would therefore not surprise me one bit if lots of people said they wanted a physical keyboard, and then went out and bought an iPhone-alike. Maybe it looked sexier on the sales floor, maybe they tried the touchscreen and found they actually liked it, or maybe just because that's what all their friends had.
If you want to know what people really want, don't listen to what they say, watch what they do.