While it is too tempting. Let's not get too carried away by this. Log(Log)) chart implies Bitcoin will be a Million dollar each before end of 2014.
I don't think many here are getting carried away in the sense that we assume much predictive power to this in a serious way. ("It cannot go on forever" certainly applies).
We just don't have the infrastructure or adoption for it yet.
Infrastructure, I agree. Adoption: well, this whole thing is adoption-driven, so adoption is predicted (if you use this model as prediction) by the model itself.