You do know that trend isn’t sustainable, right? Bitcoin evangelists in 2017 seem to love talking about the rate of increase in price as if increasing in value by 300% every couple of months is a built-in feature.
I expect bitcoin to stabilize at an ever appreciating value in line with existing inflation. And not government CPI, with their hedonic quality adjustments either, actual inflation. But I don't see getting to that point for a long long time.
Why would you expect bitcoin to stabilize? I see no mechanism that would do that. Gold has had thousands of years of use as money-like instrument, and only periods of relative (nominal) stability during the last century or so have been when there have been organizations (central banks) to keep that stable.
Yes, cryptocurrency prices will stabilize when they displace all fiat currencies ;) Because, until they do, they'll be too damn attractive for speculative investors to resist. That was part of the original plan, as I recall from discussion in various cryptoanarchist forums.