Remember that Twitch.tv started out with a guy carrying a camera on his head and lifestreaming everything.
Running a successful company depends on knowing which way the wind is blowing and adapt accordingly.
The adoption of justin.tv for e-sport was a huge surprise, but Justin.tv were smart enough to catch on to the trend and adapt.
That's also why the "ahead of their time" trope can be very misleading.
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Meerkat treated users incredibly disrespectfully, and I can't be bothered that a company might fold at the first sign of competition. It's not like Jaiku and Pownce weren't around at one point.