So...if Mosler have not study bitcoin and hi's answer is no good, please , remember first that hi is and remain one great economist .
Mosler forgot that markets choose money based on transaction costs. Practically all economic schools agree on this, yet they don't recognise it when it hits them in face.
He also spoke about price collapsing as being relevant for demand for bitcoin, but ignored the evolution of liquidity (normally, liquidity influences transaction costs more than the price changes, in particular if the good is not used as a unit of account, Paul Krugman even wrote two papers about this). On the other hand, there is no readily available information on liquidity analysis of Bitcoin that I know of, other than the one I'm working on and that's going to be in my upcoming book, Economics of Bitcoin.
These are elementary mistakes. Now, let me quote Rothbard:
It is no crime to be ignorant of economics, which is, after all, a specialized discipline and one that most people consider to be a 'dismal science.' But it is totally irresponsible to have a loud and vociferous opinion on economic subjects while remaining in this state of ignorance.
If Mosler said he does not know enough about Bitcoin to have a meaningful opinion, he would have made a much better impression on me. Rather, he made a bunch of implicit assumptions and thus appeared to affirm his ignorance.