This is pretty much the definition of a ponzi scheme. Holding an asset just because you'll be able to sell it for more later, even in the absence of any fundamental value. (And no, unless you can consume solutions to cryptographic puzzles, "mining" doesn't count as value generation.) The true value of a currency comes from its use in transactions, and a necessary condition for being useful in transactions is roughly stabilising the price level.
I'd like to hear your response to this idea, it's a theory that I've kept in mind while developing a crypto-currency (I've had to assume quite a lot to keep it short). The only rational measure of economic calculation is profit and loss, there is no accurate way to calculate the "real" value created by an activity, but the use of money allows individuals to rationally calculate the production of "real" value in an economy and thereby reward activities with wealth by using a common unit of account, money, as a rough approximation of a measure of value. Because economic calculation can only be measured through profit and loss, and profit and loss uses as its measure of value money, the way to make the calculation of profit and loss an exact science, such as physics, would be to use a stable unit of value, just as Physics uses stable units of measurement. However, because value cannot be measured, all monies released on the market are simply approximations of a unit of value (some are closer than others).
Monies chosen on the free-market, notably gold and silver have an inherent price mechanism that works to stabilize their value. If the value of gold rises, then gold mining becomes more profitable, thus more resources are allocated toward gold mining capital equipment, thereby increasing the supply of gold to offset the increased demand. If the price of gold drops, resources are directed away from gold mining capital equipment therefore causing the supply to rise at levels in tandem with the slowing demand for gold. Historical records indicate relatively stable prices of gold over centuries, from the Greeks to the Romans and up to the beginning of Central Banking, which is an empirical proof that the ideal money has stable value.
The rate of growth of an economy is determined by the rate at which individuals prefer present satisfactions over future satisfactions which decides the rate at which they allocate present resources towards present consumption and investment for greater future consumption. As an economy grows the satisfactions gained from present consumption grow in direct proportion to the satisfactions gained by future consumption so the rate of growth can only change by a species wide change in values, which is highly unlikely (although at the individual level the rates of present to future consumption are always changing). Therefore, the way to achieve long-run price stability is to simply create a create a crypto-currency with a long-term stable ratio of coin production, although it is not evidently clear what this ratio would be.
Finally, any money that has long-term changes in value will inevitably cause errors in the calculation of profit and loss in "real" terms because money is simply the unit of measurement for economic production (if Physics used units of measurement whose values changed then all calculations of moving bodies would inevitably contain errors). Therefore, an economy that uses a money that has 0% inflation will be more productive than the same economy using a money that either inflates or deflates.
Let me know what you think, I've been waiting for someone like you to talk to on this topic and I would like to delve much deeper into it.