Considering that most eReaders haven't dropped below the $100 mark--although I did manage to snag a $99 Nook as a gift for my favorite beta reader--I don't think we'll be seeing disposable eReaders anytime soon.
Still, this technology does sound promising and the article also discusses a major drawback to current generation readers (besides lack of color): slow refresh rates. The page turning on current models is just acceptable. It needs to improve by leaps and bounds before we see the types of moving images that Harry Potter made so famous. Then we can start worrying about bringing the cost down to the point where eReaders become disposable.