There are plenty of examples of how price deflationary economies grow and thrive. In fact, it is inflation that stops growth because it creates malinvestments.
The problem is that keynesians ignore the empricial evidences and keep repeating the same nonsense. If Bitcoin works or it does not it wont be due to price deflation.
Economies don't thrive because of the (small decrease or increase in the) money supply, they thrive (and increase productivity very fast causing deflation)
because the government is small. Here is
the very simple math and QTM model which refutes your popular goldbug delusion.