19% Don't Want.... Don't want & Don't care are two separate things. Regrettably, I cannot view what the "Fad poll" numbers were, but they were significantly higher than 19%
I say the numbers will increase for those who want it, as well as those that have it... gradually, over time as sets are replaced, as the format improves and the content increases.
What will deter wide spread acceptance will be:
1) The need for glasses and the reluctance of those who don't want to wear them
2) Those with visual difficulties that don't allow them to enjoy it (from headaches, eye strain, stygmatisms, etc.)
3) Content poorly converted (or poorly shot) by the movie studios & directors
J. Cameron, M Scorsese and a few others have shown how to do it right. The biggest deterent I believe will be the lack of quality content, not the first 2 variables, IMHO
Give it time! As I said previously, there are many posts by folks like me. They got their set not looking for 3D, but have become enthusiastic supporters. Early adopters rejoice we have been in on this from the beginning.