-Do we ask questions because of difficulty or because the underlying technology is more popular?
-Are javascript developers more likely to use sites like stackoverflow vs traditional means (books, mailing list, forums, etc).
-Do we underestimate javascript usage? Does javascript span more projects, i.e. I have a C# based web-project, but still use javascript for the UI.
These are the underlying questions that would have to be answered before we could derive anything from this sort of analysis. That said, in our recent study of stackoverflow questions (publication pending), we found that there was a strong correlation between the frequency of using a particular API class (as defined by google code search), and the numbers of questions asking about those classes. This could suggest questions have a large popularity component, or it could mean people are more likely to run into difficulty with popular components!