Let's hear your economic system design where anyone can gain real wealth by simply putting their cash under mattresses (as would be true if deflation were the norm). Who needs to invest in the actual productive economy?
Your argument seems to imply that the existence of even one deflationary good is sufficient to destroy an entire economy. Surely if this were the case then the law of large numbers would have killed us by now.
We've started a habit of creating periodic Bitcoin threads to confine discussion thereof to those threads and prevent excessive proliferation of Bitcoin topics in the discussion section. Here is a link to the last one, which links the other discussions. Lot's to talk about, and another bounce in Bitcoin's value (up to 33 then down to 24), so share your links and thoughts!