Wonder if Wikimedia Foundation couldn't just take the opportunity, now that Stack Overflow is alienating their userbase, to launch a rival Q&A site. I was always puzzled why did they never attempt to enter this space, even before Stack Overflow, given their prior experience in crowdsourced information commons.
Pragmatically, the software powering most their properties, MediaWiki, is not suited for it. It's hard to see them investing in development of a new platform given uncertainties of success.
