I just wrote a post along similar lines. I actually feel quite concerned at how little the current situation seems to be being talked about — i.e. the extremely fast hyper-inflation/deflation cycles-on-steroids vs the potential for cryptocurrencies to be used to actually buy things without potentially dropping in value overnight by 40% and making everything 40% more expensive.

The example you've given might make sense in terms of straight economics compared to other fiat currencies, but as long as cryptos can't be reliably used for real world spending, then I can't see how that growth will be able to continue indefinitely. It needs to be able to be used to buy things, otherwise it's basically more like shares in an imaginary company, which then starts to sound dangerously like the pyramid/ponzi examples being dished out. This is a potentially really big problem.

https://steemit.com/bitcoin/@cmaccu/bitcoin-jesus-advises-against-making-bitcoin-transactions