Block chains are a fundamental technological revolution which for the first time in human history provides a verifiable public accounting ledger which eliminates double spending, back dating transactions, and as you mentioned eliminates the ability to arbitrarily create more tokens.

Yup. I consider blockchains, at root, to be distributed DRM systems at heart: they ensure a consensus view of who has the exclusive right to use a given token at a precise moment in time. This is remarkable in that they build upon a P2P system that in the past was notorious for being piracy-friendly on the simple grounds that digital information is inherently infinitely duplicable. To think of blockchain technology in terms of currency replacement is a bit reductive (and, as far as my perspective of orthodox macroeconomics goes, pretty misguided). They will, however, have alternative applications of much greater import.