Hi,
I agree with what you say. The problem is that it is also the easiest way of dealing wth your savings. For most people, bitcoin s still some shadow money, only used for illegal trades... And actually this is not completely wrong (I mean the "illegal" part).
On top of that, when you choose to buy bitcoin, you cannot be sure of what you will get by the end of the year. With fiat currencies, you know that if your investment is secured then the interest rate will be very low but at least, unless the government collapses, the investment is secured.
Understand what I say here: I don't say that bitcoin is a bad investment, I just understand people who won't bother trying and prefer keepng all their savings in the currency they use daily.
This may change as bitcoin and its use spread.