He is not a messiah, it's already happening, people are using C#, Scala, Python, Haxe, Elm, Rust, D, Haskell to move game programming forward. E.g. Minecraft was built in Java, not C++. Game programming of today are those thousands of small indie developers experimenting, not the several hundred of bigger traditional C++ projects making big bucks.
Besides, there is not much focus on parallelism and concurrency for a performance-oriented language. By the time it hits it's first stable release the 8-core smartphones will probably be quite common.