I am amazed by how the article attempts to look forward to what the future will hold with JavaScript frameworks... and yet seems to be completely both dismiss or misunderstand (perhaps willfully) why previous frameworks have succeeded.
jQuery did not succeed because it was a 'good enough' competitor to dojo or prototype or mootools or extjs... it succeeded because it went completely the opposite direction. it did not attempt to be a fundamental ui framework like those guys, it didn't try to be full featured, it didn't try to change javascript to look like another language and didn't try to shift the paradigm of the front end development world.
jQuery did not succeed because it was a 'good enough' competitor to dojo or prototype or mootools or extjs... it succeeded because it went completely the opposite direction. it did not attempt to be a fundamental ui framework like those guys, it didn't try to be full featured, it didn't try to change javascript to look like another language and didn't try to shift the paradigm of the front end development world.