"Milestones aren't really the end of anything, they're really the beginning. So Half-Life lead to Half-Life 2. Source led to Source 2. The experiments we did with Team Fortress 2 were what enabled us to build DOTA. Artifact is the reason we're able to do Underlords. And, so, you know, maybe someday the number two will lead us to that shiny integer glowing on a mountain someplace. We'll just have to see."