You're kind of undervaluing the amount of work people have put into the mod.
Well, to be frank, the Portal series will remain dead until someone does something with it. Valve/3rd Party that doesn't require a peripheral would need to make another DLC in order to get a lot of people back playing Portal 2/Portal (lel) at once; possibly revitalizing interest in websites like TwP and mAI.
Would be a lot nicer if they update Portal 2 to steampipe.
They're converting them all to that setup as time goes by for Linux compatability. The most popular games and the oldest games are usually the easiest to port, so those go first. That means HL2/L4D2/HL1, and apparently Portal 1. I'm sure they'll get to P2 as time goes on, but it might not be until after CS:GO.
Left 4 Dead 1 isn't nearly as popular as 2, and the entirety of 1 is part of 2 at this point anyway. I'd assume its probably one of the lowest on the list.
It's pretty obvious that the more popular games come first. Even Ricochet is in beta.
I'm confused. Isn't portal 2 already steampipe? I thought steampipe was converting all the /username/ games to use /common/ and vpk, both of which already apply to portal 2.
Anything version 1 isn't piped up.
Hopefully they'll get to Portal 2. I'd really like to see AAK come to fruition after so long.