Silentpony said:
This is still a thing? People still believe there's a chance Half Life 3 is coming out?!
While it can make sense to be cynical, I don't think we can rule it out. Afterall both the Last Guardian and even more bafflingly Shenmue 3 were announced (again) at E3, albeit with a kickstarter for Shenmue. And let's not forget Duke Nukem Forever (as much as we'd like to). So it's not completely outside the realms of possibility.
That said, I'm certainly not expecting it to, and won't pay any attention to rumours or talk of its release until someone high up in valve (preferably Gabe) says 'We're making it, here's some gameplay footage, here's a release date'.
On the topic of the Mass Effect 3 thing, I can sorta see that reasoning in why they'd struggle with a script for the game, simply because of one dude, G-man. The events of episode 2 flesh out his role a bit more, to the point where it really seems like they were building to some big reveal in episode 3. The problem is, though, that he's too mysterious, with seemingly god-like powers, that any answer to who he is is automatically more boring than the intrigue of what he
could be. So, if I was a writer I'd worry about that, so that's my pet theory about why they'll never do it. You know, follow Homer Simpson's advice, never try, never fail.
Though, I of course think my pet-theory is dumb, the real reason being they make enough money through steam, and free-to-play Dota and TF2, that they don't really need to worry about selling their own AAA games anymore.