I own bitcoin. If it only ever increases in value, I'd have to be a complete idiot to spend it, when I have depreciating fiat to spend.
Its about that simple now. Whether or not that's good for the country (IE: does anything useful) is irrelevant now.
a) it has to have the fundamental properties of a good store of value
b) it requires the time it takes for most people in the world to realise this (or at least simply accept that it is a good store of value, based on the price history)
Bitcoin has far better fundamental store-of-value properties than any other asset the world has ever seen. Now we bitcoiners are just waiting for the rest of you to catch up. As you do you will store your wealth in it too, increasing the price. While it's growing like this, it experiences volatility as all growing assets do - it's called "price discovery". The waves get shallower and shallower the bigger it grows. It has the potential to store the majority of the value in the world.
To say it has no use is a big mistake to make. Possibly the biggest in your life depending on how long it takes for you to realise. It took me 10 years and cost me millions.
Bitcoin is deflationary as at some point in the future the total supply will decrease each year (through people dying with their money etc.)
This is a perversion of the economic definition of inflation and deflation.
Inflation is the rate of change of prices.
Historically speaking, the "printing too much paper money" definition of "inflation", which is more or less what you're saying is "a perversion of the economic definition of inflation", preceded the "general increase in prices" definition you're talking about: https://en.wikipedia.org/wiki/Inflation#Classical_economics
As far as i am aware nobody uses memory cards as a medium of exchange so looks like my logic holds.