Fede Alvarez is an incredibly talented guy, the only thing the clip got him was attention, he got a movie deal with Sam Raimi after many meetings, pitchings and thanks to a bunch of different projects he did before, the short film was just what put him in the map. They're not making a movie about that short.
Would love to see the Byzantine Empire utilised in a swords and sandals epic. There's been far too much attention lavished on the Western Empire over the years.