It was the first of its kind. The way it normally works is that some company includes unproven tech in their game and other follow afterward once its proven to be of benefit. But that doesn't happen if the competition keeps artificially locking you out.
Thief 4 is next in line for TressFx. There's rumors of The Witcher 3, but development seems to be leaning heavily toward Nvidia lockout for AMD card owners if past news reports are any indication.