I wouldn't say it's "wrong", any more than, e.g., this site's use of "hacker" is wrong - just jargon that isn't present in this community. It's reasonable for

I wouldn't say it's "wrong", any more than, e.g., this site's use of "hacker" is wrong - just jargon that isn't present in this community. It's reasonable for the term metagame to encompass the evolution of the strategy of a game over the years (character matchups in fighting games, use of certain "builds" in real-time strategy, etc.), as it's beyond the scope of individual matches or players; it's then reasonable to abbreviate that to "meta", as many gaming communities do, and applying it to long-term trends in things other than games is only a small semantic shift. Of course, that means little if the term doesn't actually exist here, but if it could come to exist without any especially gross abuse of language, I wouldn't call it wrong.