Alright people, calm down.
1. I don't see why this should delay the release at all. Its not like someone destroyed the source-code. They just copied it. How does that affect Valvle? The delay was most likely (I'm guessing like 99% likelyhood) not caused by this, and neither will any future delay (if there are any), so just relax.
2. This didn't "destroy 5 years of work by a team of 30 poeple" or whatever. As I've said, the original source-code is still intact. So, it really wasn't that damaging to Valve.
3. This likely won't affect any potential licensing of Source for future games. No one will release a commercial game with pirated source-code. What it could do, and I hope it does, is allow people to use the Source engine for their own freeware projects. I have long been of the opinion that free-ware and independent games are at a disadvantage simply because they have to use crappier graphics engines, so they can't compete with the AAA games. If this changes that situation, all the better.
4. I don't think this really shows that Valve is incompetent or anything. If the CIA can be hacked, so can Valve. If someone is out to hack you, and they've got enough computer skills, there's not much you can do to stop them.
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Aside from the sheer scope and importance of this, I don't think it will have any real-life consequences, or any negative ones anyway.