Thankfully, Valve has HTC building the things instead of trying to figure out manufacturing by themselves. Maybe that's enough to get them off Valve Time.
Why? They actually said some time ago that they simply didn't have a full story for it and didn't want to push towards anything unless it was what they wanted. I'm not sure they would really care about pushing HL 3 with anything specifically.
They've also said they've been waiting for technology that is palpable to what they did with the havok engine and source graphics in hl2 days. This seems to line up pretty perfectly, and I highly doubt they will just abandon the series at this point.
> I highly doubt they will just abandon the series at this point.
Yeah I don't think they would abandon the series but the way valve works it seems to me they never really cared about pairing it up unless it's something they have to do (like source). Meaning it wouldn't be any type of forced pairing.