bitcoin is overrated and overpriced
For now though, yes it is, maybe Bitcoin should go under $100 and stabilize the price. But if it goes too low, the miners will become unprofitable and they will leave.
Back in Jan/2014, the miners as a whole were getting something like 4 M$ per day. In Jun/2014 they made about 3 M$/day. The big industrial miners were probably making a good profit back then. Today, they are fighting for less than 1 M$ per day. It seems unlikely that they are still very profitable. It is no wonder that the majority of the hashpower is now in China, where electricity is cheap(*).
The hashpower (and hence the difficulty) is still increasing, perhaps because mining farm operations that started months ago are only now coming in line, and/or because the existing farms are replacing their machines by more efficient ones. Either way, the capital cost of that new equipment must be adding to the stress on miners' revenue. For some miners, the expected return from their investment may already be negative; but they may keep mining, in order to reduce their losses, until the increase in difficulty makes the marginal cost negative too.
Recall that the miners (and the entire bitcoin economy) are being supported almost entirely by the new investors who buy coins to hold. The price has fallen so much because those investors, and their money, are becoming more scarce.
In Jun/2014 those investors were putting 3 M$/day into the system for the miners, and some more for the earlier buyers who were cashing out. How much more, no one knows; for the sake of argument, lets assume that it is the same amount that they give to miners. WIth that assumption, the new investors must be pouring 2 M$/day today.
Today's new investors are motivated by the hope that some day -- say, in early 2016 -- they will be able to sell their coins for a lot more -- say, at least 500 $/BTC. For that to happen, the new investors on that future date would have to put 6 M$/day into the system -- 2 M$/day to buy the coins produced by the miners, and 4 M$/day to buy the coins that today's investors are buying now, assumed to be worth 2 M$/day. And those future investors must be motivated by the hope of selling their 500$ coins for 1000$, say in early 2017; which means that, by that date (post-halving), new investors should be pouring in 2 M$/day for the miners and 8 M$/day for the previous year's investors, or 10 M$/day. And so on.
Good luck with that.
(*) I have read unconfirmed rumours that Friedcat, the CEO of the Chinese mining company AMHash, disappeared because the government discovered that his mine was getting its power from a food factory, which was heavily subsidized by the Chinese goverment.