Don't think Source ever won out, Global Offensive was the game to dethrone 1.6. At least in our "semi-professional" neck of the woods CS:S adoption was 30% at best. A clear majority were still playing 1.6 even when Global Offensive came out, and even then it took a year or two of updates to make that game good enough to start convincing significant portions of people to switch over.
For example in 2011 Electronic Sports World Cup just before Global Offensive came out 1.6 still had a significantly larger price pool than CS:S. Funnily it was also the first and last ESWC to even have a CS:S tournament, even though the game had been out for 7 years at that point.
Cool. Thanks for the history. I fell off CS except for occasional casual sundays and dove head first into MMO land around that time so it's all rather fuzzy. I kinda forgot Global Offensive was it's own release.
