I'm a huge HL fan. To be honest, every HL game came with huge advancements in technology and launched the base for several other amazing games using the same engine! If Half-Life 3 where to come out there has to be HUGE advancement in technology once again. Or else if will just be another flavour of Half Life 2. And I think they made a really good decision here. I believe that HL 3 HAS to be in VR to make it truly worth the title! They know that tech has to me more widely available and cheaper before they can go ahead and start revolutionising industry again.