[pfranz]

Unless I'm misunderstanding you, those aren't the answer. I think the article title is a bit too vague. They're talking about probability of 3D for hardware accelerated rendering. Unity and Unreal Engine are complete game engines. Hardware accelerated rendering gets a lot of focus on games, but is used quite a bit elsewhere; apps for video editing, sound editing, 3d content generation (Maya, Houdini), CAD (the originator of OpenGL), and I think the UI on all major platforms are all hardware accelerated. Also, many game studios write their own engines in house because those game engines are big and a lot of "baggage" can come with that.