I definitely won't buy a VR headset in the near future so I'm not interested in this game specifically. But I am a fan of Half Life series and I see this as good move. I hope they are thinking about this as a test to see how people react to a HL game after all these years and if the reception is good enough, they release a true HL3 that doesn't need a VR headset to be played.
Like I mentioned in another thread, and I know not a lot of pepole will agree with me, I would love to see a fully open world Half Like game set in City 17 and around it. Kind of like Dying Light (I can't wait for Dying Light 2 to come out, btw). I know that is a total opposite of the scripted, linear structure HL1 and 2 have, but I always wanted to know what it would look like.