Care to explain why the minimum price is linear according to you? I mean... why not a curve? Wouldn't a curve be more likely?
I can't.
If you draw trendlines they usually fail in predictive power unless they are linear, the only explanation I have is crowd psychology. Other than that it seems completely random...
Well I would think that a (very slight) curve has its place since it represents an accelerating amount of 'hard-base users'. A linear line implies growth at the same rate. In the case of Bitcoin, which is now very slowly starting to trickle into mainstream, I see the former model as more representative; snowball style.
There really seem to be three futures for Bitcoin, which I think help decide the growth in terms of value vs. fiat currency:
1) Faith in the system falters, media attention causes concern, governments try to ban/outlaw it, etc. etc. - something that prevents mainstream adoption and the abandonment by all but the die-hards. In this case, the price would drop down and stay low.
2) Mainstream adoption doesn't really happen, but people tend to continue supporting it; value vs. the U.S. dollar would meander along, but not significantly change
3) It continues to grow and be adopted further, become more popular, and basically have a good future. This is the likely option I see - in this case, the price would (should) rise. How much? Well, I would say the
percentage rise would be about constant long-term, rather than the dollar value rise. IOW, if the growth is about $1 per month now (10%), when the value reaches $100 it would be up to $10/month value increase (stilll 10%). This would mean a curve when looking at dollar value, but a line when looking at day-over-day percentage increase.
Over short periods of time, linear is probably a good approximation. However, a $1 change in price at $10/BTC becomes a much less significant change at $100/BTC or $1000/BTC.
As a sidenote, I had noticed a while back that if you block out the part of the all-time graph between May and November 2011, the rest of the graph forms a nice trend. And the only reason I even consider leaving out a block like that is because of all the hype and media attention at that time (good and bad), and basically the whole system was more immature at the time. Not that Bitcoin is old, mature or stable
yet, it simply is
more than at that time. Leaving out that noisy bubble period, the linear trendline I drew a few months back wound up around $8 for the end of 2012, which we still seem on track for, and I personally believe may be realistic.