Valve has been pushing hard in the development of games being integrated with VR headset. With Oculus Rift rapidly growing to become a core tool in the gaming industry, Valve might just wait a little more before they start integrating the technology with their games.
If Oculus Rift is to come out functioning like a tech wonder, then there is no doubt Valve will adopt the technology for their games. Obviously, there is no better way to introduce VR headsets on a game than through using it to play Half Life 3.
Hence, there is a chance for Oculus Rift to be the reason for the long wait for Half Life 3. The highly anticipated sequel is expected to be phenomenal when launched and there is no better way to kick start the Oculus Rift era than through Half Life 3.