I am just assuming that if the filmmakers finally dare to use real-time engine like that combined with real world commercially
That's not quite how I would read that statement. Film makers already use a lot of real-time tools, which are very similar to their games counterparts (motion capture, scene previewing, etc), but the final production step will typically use an incredibly time-consuming offline renderer, at a much higher quality than we can possibly drive in real-time.
Yeah I probably wasn't clear, what I mean by using real-time engine is by eliminating that time-consuming offline rendering process. But just by judging from a proposal video like that I may be wrong though. Thanks for the enlightenment.