Do you participate in any language popularity study that you stumble upon? I know I don't. Add 99% of all my colleagues ever don't as well.

Even if I found a study that corroborated my observation I'd still not trust it. I don't make a habit out of supporting dubious studies only because they support my point of view.

From what I've seen for 19 years of career, most working programmers refuse to participate in such studies.

Hence I don't trust them either way. They work with a non-representative sample of the population. Not a big enough sample for the study to be valid.