You my friend, have just made that up. If you look into science, exponential growth does the same thing. It gets High, and then crashed, and again, and again, until it stabilizes or it wipes it's self out.
In for example biology exponential growth slows down because of the carrying capacity of the environment. The same thing happens to bitcoin and everything else, nothing tends to infinity. However, your straight lines in a log scale do. Expand your picture a bit with the same lines; what sort of a value does your lower limit predict? Something like 100-500 USD/bitcoin in one year? How about after two years? 1000-5000 USD/bitcoin? In 10 years, I guess everyone will be really rich if that goes on, because it will be worth... 100-500 * 10^9 USD / bitcoin, so "only" 100-500 billion USD per coin.
That's why "fitting" straight lines into a log curve doesn't work.
I am defending the picture, the original isn't mine. I simply reinforced the trend it said. I didn't do the math behind it, as I was defending it. Assuming the trend continues, and Bitcoin evens out. I would assume the price would be the mean of the High/low fit at that time. That's only IF the economy puts out the demand for that amount.