Well I think the vibe of this clip was much more creepy and nightmare-inducing than the Resident Evil series has turned out to be. RE is about zombies and zombie-related things that have "normal" counterparts, this had children's dolls, really thick suspense and undertones of murder. Also, Leon's reliance on the flashlight makes for a much more intense atmosphere than the RE series, so I think the entire thing would be best suited in a new IP.
I'm not saying RE should deviate from what it's become, because RE4 was excellent, but this was clearly a totally different game. They could take this concept and polish it until they have another successful franchise on their hands that began as a branch of RE, like what you said happened with DMC. It would be a great thing, I think.