Seems like a more broad question for the general forum. And it's hard to think of games not ever developing beyond simple ones if the rest of technology advances. But just going by the idea that it somehow never comes to be, for as broad as these ideas may be:What if video game never existed or would be far more of a niche hobby. Even if they existed they would still be similar to Pong technologically speaking.
- Atari would never exist (Duh), or if it does, primarily develops simple electronic games alongside more advanced mechanical ones.
- Nintendo, Sega, Sony, and Microsoft remain mostly where they were before they got into games in our timeline (Toys, coin-operated machines, electronics, and computers respectively).
- Arcade culture and iconography as we know it doesn't exist or is in a far different form, relying mostly on electro-mechanical devices (Basically a lot more pinball or machines that rely on some physicality).
- Most game creatives would find different lots in life (Maybe Miyamoto becomes a manga artist as he dreamed before getting into games?)