It's a shame Half Life has stories to resolve. We don't need another Half Life game - what we need is innovation only Valve can bring (think original Half Life, L4D and Portal). The gaming industry is today over saturated with linear shooters, and even though the Half Life formula is pretty solid and has a fan base, I'd very much prefer to see a new, mind-blowing innovation from Valve. Half Life can never satisfy all these years of hype anyway.
Less sequel, moar new stuff!