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WordPress support for data stores other than MySQL would bust every theme, plugin, widget, and value-add (other than your thoughtful words) for WordPress on the planet.
So naturally, the roadmap to do so is “well, if someone pays us…”
I challenge someone to actually break and remake WordPress with an abstraction layer that’d let it run in MySQL-less environments like Google App Engine or Windows Azure.
What? No, I don’t have time to do it myself. Well, if you pay me…