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I think I may have convinced enough people at my school that we need one. We might have one for next year. I'll take orders on things you want me to print as soon as I can.
You can already order things from places like Shapeways ( I think the main driver for having a home printer is prototyping in plastic before getting pieces in nicer materials. I'm not sure how it scales if you want real volume though.
The big problem is there still painfully slow, and most have abysmal resolution.
Resolution of hobbyist machines has been improving; the Ultimaker does some very fine prints (although not as good as shapeways). The main issue is that they're unreliable; you can't just buy one and expect it to churn out pieces without regular maintenance.
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