This talk of doubling times is my cue to weigh in with an update, calling it as I sees it.
The bull mode begun mid-2015 is clearly in full flight, we crossed $1500 conclusively around May 1 and now it seems like $3000 will form a base soon enough. So doubling period is currently ~6 weeks. Given that, the blow-off of this adoption wave is likely has 2~3 doublings left, final top still targetting around 10-12k near end of July.
I refuse to call these bull runs "bubbles" as that is incorrect. Bubbles form once and then the speculative asset is sold down to worthlessness. After each major pullback the bitcoin market capitalisation (total float value) has never dropped below it's previous top in major fiat denominations. I just cannot believe how even respected Elliot wave analysts have fallen into the mind-trap of incorrectly referring to these bitcoin adoption waves as "bubbles".
I'm going to have to fix my ways in regards to my bubble reference matters, but if we get into 2x reference matters or even describing what happened in the BTC market, I see the situation a bit differently.. maybe I am too bearish?
1) I will assert that this BTC price climb started at about $250 in October 2015;
2) By December 2015 (about 10 weeks later), the price mostly stabilized above $410 (about a 65% increase)
3) By June 2016 (about 6 months later), the price mostly stabilized above $586 (about a 43% increase)
4) By December 2016 (about 6 months later), the price mostly stabilized above $800) (about a 37% increase)
5) In the past 11 weeks, the price largely grew exponentially from $890 to $2960 (about a 333% increase) (an average of about 30% increase per week)
I don't know what to make out of all of these facts, but is seems like the past 11 weeks are in a kind of unstable exponential growth period.
Sure, I have already hypothesized similar to you, Marcus, that we have another month and a half growth that is quite possible, and I am basing my assertion on the increased volume of money that seems to be coming into the crypto space that is not likely to dry up any time soon and likely to affect bitcoin prices, specifically.
Previously, I had considered $6k to be the top of any expected exponential bubble, but currently, I am trying to purge my bearish thoughts in order to help myself to consider prices approaching $10k as within the realm of "reasonable."