I understand your point, but mindshare can be difficult to evaluate. Do you actually know how popular Mojito is? I certainly have noticed the popularity of Meteor - and unpopularity of Mojito - on HN, but how does that translate to the general population of developers?

Indeed. Sentiment analysis is a problem. I think there are some companies working.

It is a real phenomenon, but just hard to access empirical quantified data at the moment.

As a quick measure I use things like Google Insights, compete.com, Github presence / stats etc.