bitcoin will go to 4-5 usd.
You mean it will be attacked on the network level (51% attack?)
Or is your projection that it'll go to $5 based solely on insufficient demand for bitcoin?
Bitcoin is not more interesting,and as such has no more investors, and losing popularity.
All this so far has been an artificial raising popularity, using various speculations of mining hardware manufacturer.
Now is mining factor 5.5 cents per Gh at 24 hour, and for next 12 days it will be about 4 cents per Gh at 24 hours, and here is begin of end for crypto coins.
Soon, people will to realize that been deceived.
If you have a memory span of more than a few weeks, you will remember that bitcoin's popularity comes in cycles. Take a look at the summer 2013 graph and see that it lost a lot of interest, only to gain it back in November. Besides, you must be aware that the world is awash with fiat, Fed is printing dollars like there is no tomorrow, every other country is following them on that path, and people don't see any good investment options to choose from to dump their depreciating fiat into. That pretty much guarantees a lot of interest for bitcoin, when the next cycle of popularity comes, as it did in the past. Nothing has changed since a few years ago, we're seeing more of the same, hence the trends of the past apply.
Which means, your calculations of USD/Gh will be rendered invalid when the price goes up, then this 5 cents per Gh will start growing again, where it becomes (more) profitable, and the next mining rush takes place.
You will be proven right in the end, but it won't be this year, sorry. It will be a few years later, when Bitcoin mining has taken a significant portion of world's electricity consumption and pushed against natural limits, and when Proof-of-Stake cryptos have established themselves to take over the race from bitcoin.
