Make a $99 one aimed at kids. Doesn't produce anything really useful, but yes, you can print all kinds of cool-looking shit. It'd help if the plastic can be melted down and reused over and over like Play-Doh. An open API, plus mechanical hackability should be implicit in its design, if not necessarily condoned ('warranty void if broken' and so on.) Something like that would get the ball rolling.
And HELL NO! about selling them on the inkjet pricing model. Everyone hates inkjets for that very reason. We all know it's a scam, but we need to print stuff on paper once in awhile, so what ya gonna do? Your Average Joe doesn't need 3D printing, at least not yet. We want people to love 3D printers like they love their smartphones.