Generalizing the pinball discussion, should the domain of the side include all electronic games? I'm not sure how far this would extend beyond pinball and other arcade games.
The obvious question is why?
Stack Exchange isn't Yahoo! Answers or Quora: not every topic needs to be covered. If something isn't covered by existing sites, it's perfectly okay.
And we're not hurting from traffic or lack of quality questions that dooms more specialized sites on the network. We have our hands full already with just video game questions.
So what benefit do we get from muddying up the current scope to include non-video games? Is there an installed base of electronic game experts here? For that matter, where's the cultural overlap between video gamers and electronic gamers?
If there's a big push to have an electronic games site on Area 51, it's going to get shut down, and it's demonstrable that electronic gamers consider themselves to be video gamers (in the sense that we do here on Gaming: i.e., they enjoy console/mobile/desktop video games and will ask/answer questions about them), sure.
Otherwise, this is needless scope creep and boo to that. We should be jealous of our site's purpose and scope and only expand it if it's absolutely going to be a win for what we're already doing here. I don't see how expanding to electronic games helps that.