I noticed that a few years ago and found it surprising but figured it would show up soon. Is there a technical reason it hasn't, or just lack of sufficient motivation an anyone's part?
Apparently wikipedia's format is a pain to parse. I think jgm posts here as fiddlosopher he is the best source for the gory details...
But there is definitely sufficient motivation just google "convert wikipedia to" for some examples. I think that the arcane syntax is a big lockin factor with large wikipedia based sites...