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So you want both a currency that has the hallmark feature of not being concerned with exchange rate (
B) and a currency that has investment appeal (
A)? Are you sure you aren't mixing up currency as a unit of exchange and wealth/savings/investments as saved capital surplus?
Realize that A comes before B. B is the goal, where at which time A cashes out without ponzi crash, because B supplies demand. This is accomplished by raising transactions to a very high level early with PC mining.
You can't have high level of transactions at an early stage because it's an early stage. So you've arrived back at bitcoin. Currently it is in stage A. Possibly it will get to stage B.
The early adopters are always being diluted by coin rewards which are going to PC mining, which is thus deconcentrating (dispersing in smaller morsels) the coin and developing a spending demand. Imagine two curves and at some point they cross, the hoarders on the way down and the spenders on the way up. Gradually the speculative gain function declines relative to the spending function.
The
3% power-law distributed most wealthy, do not hold their net worth in currency. They hold many forms of assets.
Bitcoin can't do this, because there isn't any trend to spending which doesn't
bankrupt the middle class. Thus the only way for
Bitcoiners to exit is via "rake", i.e. not spending (nor investing as BTC) rather converting back to fiat.