For one it would provide incentive to save money and spend it wisely, instead of mindlessly buying all that unnecessary crap.
And debtors. The very notion of taking out a loan for something becomes nigh impossible with a deflationary currency, particularly one as deflationary as Bitcoin. Seeing as how the lower and middle class tend to take out loans for all sorts of reasons (since if they had the sort of cash lying around to buy homes and cars and appliances and such outright, they probably would be neither lower nor middle class), the direct harm such a currency would have is readily apparent.
I also don't see how Keynes and speculative frenzies are connected, considering they existed long before his Treatise or General Theory.
Now that wording has a certain ring to it (in my ears).
"Consumption prone to drying up"? As if consumption alone were of any value. As if consumption were the foundation of all well being. As if it were something that needs to be tended to like some garden with flower beds.
Sounds more like ideology to me instead of reasoning.
In fact, Keynes himself famously thought that would be working 15 hours a week by now instead of...well...wherever all the work is going, some of which I suppose is propping up the consumption you don't approve of.
