2. as a legitimate currency which people use to store wealth regardless of its price compared to fiat currencies?
If enough people will be using bitcoin and think of it as legitimate currency/asset then it will become one.
This is already happening worldwide, Bitcoin growing acceptance pushed Japan to accept it as legal tender,
Australia will follow with the same law in July. Fiat currencies might be more stable, less volatile and widely used,
but in the end they will reach the point when quantitative easing, national debt, inflation, global economic crisis
or other random event will make it worthless, or a least their purchasing power will be significantly lowered.
With bitcoin being somewhat more of an alternative economy, it is less likely to happen.