At this point, the counter problem is growing: the legitimate alternative meanings of the term “open source” are getting more used as time goes, not less, and speaking personally I don’t think maintenance or blog posts is going to fix it. Creative Commons licenses got pretty good at this by adding more words to each variant of their license titles. What about that? There’s an inherent problem with hoping to keep a term as short and generic as “open source”, when the issues you care about are separate from whether you’re allowed to look at the source.