Agreed, with people at twitter, facebook and all other places constantly coming up with more and more JS libraries, there is enough evidence that the existing ones are insufficient at some level. And even if they weren't, having choices is good to have in an open source (very loosely used) community.
I'm admittedly biased (as someone who doesn't care much for JavaScript) but I take the flailing framework situation as confirmation that JavaScript+DOM is a shitty foundation to build full-fledged apps in.
