What do you mean by justifiable price? Bitcoin is 99% speculation, and in case you mean its price justified by its real life application, what you should be, it is pretty close to zero.
With justifiable price I am referring to a steady form of growth that is based on worthy developments, which Segwit is one of, and the fact that more capital is being pumped into this ecosystem, and also the fact that people buy it as store of value. It's all part of Bitcoin's utility. I agree that the actual usage is lacking, but that doesn't make the speculative aspect not be an important aspect.
If you are going to challenge this point somehow, think first how many Bitcoin whales could easily crash the price to single digits. And this is what happening right now, isn't? I mean whales taking the price where it truly belongs, to single digits.
It again comes down to the point that the market is adjusting itself to the justifiable levels I am talking about. It won't get dumped down bad, but at the same time there is not a price you can point at as being that justifiable price - the market will adjust itself to such levels, and what the final bottom will be is something we will find out after we have started to go up again. You may not agree with it, but that's not my problem. To add; orderbooks of exchanges have always been lacking liquidity, so a serious group of whales will not have any problem one-shotting a certain exchange to double digits or in an extreme case single digits, but it will cost them badly.