Poetic Nova said:
Eh, doesn't mean L4D2, or Portal 1 and 2 suddenly dissappear. Or Half Life 1 and expansions for that matter. I stil play those games fondly.
The problem is that NONE of those series are finished. You could argue that Left 4 Dead was never really meant to have an end point, but the second game revealed some interesting story points about the four heroes, and it was pretty clear they were going to give us more in the next game.
And while Chell's adventure seems to be over, and thus possibly Portal as a whole, it's still really easy to make more in the series especially considering Chell is now outside and quite possibly going to run into beings from the Half-Life story now.
And as for Half-Life itself, well...you play those games still. You've seen that horrible ending in Episode 2.
Yeah, those games haven't disappeared and they're still all really amazing, but they also serve as not only a painful reminder of what Valve was once, but also as a reminder that we are never going to see them concluded.