I consider data before this time period to be useless for TA due to Gox bots and the overall bubble atmosphere. Now let me explain the significance of each line. The top line is set at points where BTC was able to maintain a somewhat stable price averaged over 6 months. The bottom line is the bargain basement prices during that time period.
Some people will claim I'm ignoring the upshoot early on in the chart, but it was just a pump that caused a long, perpetual downslide, so I don't think it should be given much credence. If you look only at these two lines, you would see a downtrend, but a fair current day price of BTC.
The trend obviously does not continue to infinity until it's below negative. Commodity value is highly influenced by cost of production, so eventually the downtrend, or general market sentiment, collides with the production cost, a large portion of market fundamentals.
How does that help you make money? It doesn't. The current TA BTC price is exactly where it should be. You have to apply fundamentals to go any further. TA is completely useless to predict anything past that point.
All it comes down to is, for short term, anything is possible, but for long term, do you think BTC will exist in the 3rd quarter of 2016 with equal or greater validity than now and won't experience a huge crash in the meanwhile? The numbers say it should likely not fall below previous ATH of $260, so when the next halving comes, that means most likely anywhere from a 50% to 100% increase.
A poor case scenario would be $260 x 1.5 = $390. That's 11.4% interest for buying today at $350 and holding for 2 years even with a semi-bad case short term scenario.
This tells me that anyone sitting on tons of fiat for some reason would be kinda foolish to not diversify a small amount into BTC. For people with little spare income, hodling for those kind of numbers might not be very attractive, but that was just a stagnant BTC estimate and not one of exponential growth. This was mostly an analysis for people who want to buy and hold for a couple years and are looking at what they can get out of it without exponential growth occurring while the market remains relatively stagnant.
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