I haven't encountered anyone like that yet, but I wouldn't doubt that such people exist. There are some people who, for whatever reason, be they religious or just plain nutters, are sheltered for most of their lives. My niece and nephews are growing up without a TV, and that is just fine. They don't need it. But, not having one will hinder any "current events" assignments they need to do. But, also, due to not being exposed to the media, they will also not be very informative (I guess) when it comes to the latest gaming systems, or even gaming in general. So, I can see them becoming those types of people who haven't a clue about gaming history.
Thankfully, though, they have me. I'm the family's ultra-nerd. They need to be caught up on something nerdy, they come to me.
But anyway, it's certainly plausible that there will be people who have not a single clue about gaming history. Like Amish people. Think they'd know about the Dreamcast?
But yeah, I have no idea where I was going with this.