I'm not sure of this, but I think for the next 2 years, the value of Bitcoin will be over 8000$ if there's nothing wrong that will happen. Bitcoin reached the 4000 dollar mark from 2400$ in just 20 days and it is because of the success of the segwit. And since it was already issued that there'll be another in the month of November, and if it will be again, successful, definitely, the price of Bitcoin will then again increase and maybe reach the 5000$ mark before this year end. So 2 years is quite enough to make speculations about the increase on its future market value.