So you admit you don't really know much about the matter, but consider your opinion qualified by virtue of somebody asking you for your opinion?
Yes, I admit that I don't know much about OSS. But I did not state that I have a qualified opinion. In fact, I answered "Don't know/no opinion" on those questions.
The reason I posted my reply was to indicate that there must be some people worried about the situation, or it wouldn't have appeared in a survey from a very large, frequently mentioned on HN, tech company.
You can ask me what I think about inflation but that wouldn't make me an economist, would it?
No, but you could relay the fact that somewhere there are people who are apparently concerned enough about inflation to ask you about it.
Would there be any significance to the question if the people asking about it weren't themselves economists?
It's a strange question, to ask if OSS will still be around that far in the future. It (albeit without the name) has been around longer than proprietary software. Did your survey ask if proprietary software would still be around in 20 years? I think it should have.
You can ask me what I think about inflation but that wouldn't make me an economist, would it?