Rumors of "Left 4 Dead 3" arise after long silence

I’m sorry, but there’s no-one working on Half-Life 3 and much of this is due to the culture of Valve - they are in a fire-at-will state and so staff avoid projects which are likely to fail and with how high expectations are for HL3 and how long people have been waiting for it, it is bound to disappoint regardless of how good it actually is. Which means people will avoid it like the plague because it could ruin their career.

HL3 will only happen when people stop talking about it and cease holding expectations that simply cannot be met. We are the reason why HL3 remains vapourware.