Is SCART on its way out, with HDMI the successor?
DVD is on its way out, with BluRay the successor.
And as BluRay players don't support scart, yes, it would make total sense to have at least one other HDMI cable run through the wall. Not only are machines with scart output becoming rarer, but TVs with scart input also.
I have a Sky box, a Blu Ray player and a DVD recorder connected to my TV. I haven't used a scart cable in years...