For a preview of what video games being "mainstream" looks like: South Korea. It's not unthinkable we could get there in the west.
as reference, according to wiktionary, mainstream is Used or accepted broadly rather than by small portions of a population or market. I think that definition can encompass 40,000,000 households owning consoles.
Wii Sports (12 years old) sold 80 million copies. That's more than any album ever.
Individual videogames regularly sell more than MUSIC and have done so for well over a decade.
I don't know what definition of mainstream there is where something sells 80 million copies and still isn't mainstream.
Super Mario Bros sold over 40 million copies.
Both of those games are 30 years old. Wii Sports was not even close to being one of the first mainstream games.
The original Pokemon games sold over 30 million copies, inspired a massive worldwide TV show, and that was over 20 years ago.
It wasnt mainstream in the 90’ies which is where i predicted that one say you would be able to score girls by being a famous gamer.
I'm pretty sure this was different in the 80s.
http://www.pewinternet.org/2015/12/15/who-plays-video-games-...
This doesn't strike me as a useful definition of mainstream.
I live in Vietnam and I guarantee you that no one here could tell you a single thing about baseball, The Beatles, or Elvis.
Hell, just go to Australia/UK and no one will be able to explain baseball to you. Just like you can go to the US and no one understands cricket even though nearly 1 billion people (albeit primarily in the ex-British Commonwealth) do.
In any case, your claims about the video game market 15 years ago (in 2003) aren't accurate. In 2003 videogames in the US sold 240 million units. 54% of American households bought a new videogame -- that's far from "mostly something upper-middle-class children owned".
15 years ago 32% of households were already playing video games on a mobile device (phone, PDA, handheld game system). 35% of parents said they played video games. 69% of households said they played computer & video games.
15 years ago 2/3rd of Americans played video games. It was already mainstream. Sure, it has gotten MORE popular since then. But that doesn't mean it wasn't mainstream.