Polaroid had a long, good run. There've already been digital cameras that would let you snap a pic and then, at your leisure, commit it to emulsion via the integrated Polaroid photo printer. Thus:

http://www.dpreview.com/news/0007/00072502c211zoom.asp

Zink's "inkless printing" is just Polaroid film all over again, except with heat instead of light to set the image. And with a much smaller market, so you can bet it'll be more expensive, and discontinued sooner.