it's on a decline for a few weeks
its up a ridiculous amount since March
Which implies it's horribly unstable as it is now.
No, it means its new, its not that new things cant be stable, its just that there is no point of reference with which to define "stable".
If you want it to be a currency then it needs to stawnd as an alternative to other currencies. There cant be a period of "Well it looks like shit NOW, but in the future~"
And what does it look like now? It looks fine, for the first time the exchange rate is stable, its standing just fine. As a medium for trade, the exchange rate does not affect is ease of use. This new found stability may be a short phase or a new trend, but regardless it shows that Bitcoin has the potential to be a stable medium. And that wild price fluctuations are not internet to the system.