Disposable Blu-ray discs.

It's not even out in non-disposable form yet, but this PCWorld.com article lists a few gadgets that are on their way from Japan, including dispoable blu-ray discs. the article describes the recycle-able Blue-Ray (next generation, high-density format DVD) discs made from paper. My question is; if this is possible with Blu-ray, why aren't there more disposable CD's and DVD's currently available. For example, those given away with newspapers, magazines, MSDN (whoops, sorry M$)?