An LCD that large? I think you'd have far worse concerns about picture quality than black level at that point... And let's just forget that a single movie theater sized LCD screen would probably cost more than all the projectors in the entire theater combined. Sizes that large just plain can't be done with plasma or OLED (I believe, correct me if I'm wrong). I'm just not sure what you want here.
Projection can be amazing when done to strict standards (like some dedicated home theaters, where it's easier to control the conditions), but when you're dealing with screen sizes and rooms that large, the ambient light that some theaters have (lights get dimmed instead of shut off, walkway lights, etc.), and probably a hundred other factors, you just can't expect it to be perfect. Projector technology is evolving though, so it can only get better.
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