>Deflationary currencies reward saving over spending. Aka, you can just sit on your money and it increases in value.
>That's really bad for an economy.
The economy is hardly in brilliant shape right now. This process of Boom/Bust has been running for the last century or so and they still cannot control it (or properly understand it) and they have had a lot of time to try and master fiat currency, controls, regulation etc. You say that people saving is bad for an economy, but that implies that the only good thing for an economy is constant spending and growth. That is bad for an economy, the belief that only through constant growth can the economy work. At somepoint there is a plateau, the planet cannot support an infinite number of people, at some point the world economy will stop growing. according to current thinking that may as well indicate the end of the economic world as we know it.
It is time to try something new, it may go against what most people believe but it cannot be any worse than the current situation which is not working as evidenced by the economic slump of recent years.
That's really bad for an economy.
My ideal cryptocurrency would constantly "leak" money, trying to maintain a 0.1% or so inflation rate a year, to prevent this problem.