Well if you followed Ti3 for Dota 2, there was 1.1 million concurrent viewers for the event during the finals (250k in game, 500k+ on streams and 250k+ on china streams) and that was during WCS. Even Teamliquid's boss was at the event instead of WCS, the WCS stream at that period barely had close to 90k -100k views at the peak period and it averaged at 50k viewers (some LoL streamers get that number of viewers at their peak period) at group stages. Hell even our local cybercafes set up projectors to watch our Malaysian team play in Ti3 and there was HUGE crowd watching outside the Cybercafes. There is also a visible number of empty chairs during the WCS event compared to Ti3 and it was obvious Blizzard expected a way bigger crowd and it fell very very short. The way Blizzard planned the event clearly showed how little they understood how esports worked and both GomTV's Mr. Chae and Teamliquid's boss Nazgul had to agree on the stupidity of putting WCS at the same time with Ti3.

As for Starcraft 2 in Asia, you can forget it ever getting big with other titles far exceeding in popularity. Starcraft 2 has not been in the top 10 most played Korean games for at least 3 years already, League of Legends has basically replaced Broodwar as the most popular video game when Blizzard had the biggest and fattest chance to do it, instead they botched everything by releasing a subpar game with a subpar online service and making enemies with Kespa. At China, Dota and LoL are far far popular and Starcraft 2 never stood a chance in even taking a small market share.

At US, the scene is shrinking so fast its not even funny due to the massive popularity of LoL and the rise of American Dota, even the latest MLG has not included SC2 in their events as both Dota and LoL will easily get 3-10X more views compared to the SC2 stream.

I myself lost interest in the game extremely quickly due to how poorly the multiplayer and Battle.net 2.0 was designed, 99% of my friendlist simply stopped playing after the second month. Even I wondered if they could release a title so bad at launch and hype it so much, how awful would Diablo 3 end up during launch and my god was Diablo 3 was awful.
Link to video interview