Well, first, I think what Stephenson is attempting to do isn't anything new. Jetse de Vries released an anthology a few years back, Shine: An Anthology of Optimistic SF.
Second, it also depends on the SF that you're reading. Haikasoru has been translating Japanese SF and some of them are optimistic in tone and nature. (It's also interesting to read at how their fears are completely the opposite of other cultures; we fear overpopulation, they fear underpopulation.)
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