Arthur C. Clarke also envisioned 3D video games in a 1950s novel, the title of which escapes me. In that book, humans a million years in the future all live underground, and have a virtual reality-like game in which they fight monsters in dangerous caves.
By the same Tolkien, the same decade had a writer who presaged D&D. :)
By the same Tolkien, the same decade had a writer who presaged D&D. :)