The funniest possible thing Valve could do would be release Episode 3 in the Source Engine reusing all the assets they did through the rest of the episodes, and have it just be episode length. Just continue episodic development as if 16 years haven't passed since.
Game programmer, designer, director; retired quadball player; antimeme; radical descriptivist; antilabel; Moose;
Working at Muse Games. Directed Embr, worked on Wildmender and Guns of Icarus, Making new secret stuffs
Opinions are everyone else's