> When a game will have a ray-tracing display, then we will think to give up.

I don't know. Just because something is ray-traced doesn't automatically 
make it look amazing. I remember somebody managed to build a FPGA that 
does real-time ray-tracing. They ported the Quake 4 (?) engine to run on 
it. The screen-shots looked... rubbish. Because it's ray-tracing flat 
polygons with bilinear textures and no bump-maps.

*We* think of ray-tracing as the ultimate in realism more because we're 
rendering implicit surfaces and area lights and diffuse 
inter-reflections. If you take a regular game engine (which ONLY renders 
flat polygons) and ray-trace that... it doesn't actually look much 
different, TBH.

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