Over the last few years 3d printing has come on dramatically, it's great for rapid prototyping.
Unfortunately though the average home user doesn't really have much need for rapid prototyping, and most of the things which come out of current 3d printers just don't look polished enough to appeal. They're still very rough looking, more the type of thing which'd come out of a Christmas cracker than the type of thing most people would want as decor.
In terms of software I don't think a more user-friendly 3d editor will help too much. I view 3d product design as similar to writing software, you can make it more accessible but most people are just going to be interested in the library of things other people have developed. Make a library of designs which the average person (not the average current 3d printer owner, they're more enthusiast) will find interesting, attractive, and useful and maybe you'll break the mainstream- until then it's the realm of the tinkerer and the hacker. Most people don't need or want a print out of the Stanford rabbit.
I'm not saying this isn't of interest or use, I may have pledged for one myself if I didn't find paying the import duties to the UK to be so painful (Anyone want to Kickstart a business importing other business' Kickstarters?), but it's still just another 3d printer. I don't think it's the type of thing I'd be recommending to my parents and neighbours though, I just don't think they'd want to deal with the hassles that 3d printers currently bring in exchange for the benefits. How much 3d printing do most people actually need?
What I do see as becoming more popular is the shared printer. People at home make orders for larger and well-finished 3d objects selected from a catalogue and printed on a very nice printer, and they either post them or make them available for collection at central points. I know businesses like Shapeways do this already but the price isn't right for most people yet, it needs to be the case where printing a vase isn't that much more expensive than buying one, and printing a piece to fix your plumbing should be easily affordable.