Why Isn't Google Closure More Popular? [closed]

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So, Google released this sweet little framework a year or two 开发者_开发百科ago called Closure. There hasn't been much adoption (other than playing w/ the compiler's advanced compile feature ;) and I'm curious as to why.

Is it because of the initial overhead to setup and integrate Closure in to your build? Is the actual js library too verbose/foreign (relative to other js frameworks)? Did the "bad press" it received right after launch (re: inefficient techniques and bad practices) leave a bad taste in the mouths of developers? Is Closure more geared towards web-apps than websites (where, obviously, websites are more prevalent)? Or is everyone really just that satisfied with jQuery*?

For the record, when I say Closure I mean the whole suite of tools: the compiler, js library, templating system, and linter/inspector. Also, I would love answers tailored more to a site that's in Alexa's top 500 than your average mom and pop shop.