Difficulty is up value is down luck also. Not very good times for miners.
I see the value continuing to go down. In the coming months you will see a shift from GPU mining to ASIC mining. GPU miners will start to get out because it's not cost effective.
And the small time GPU miners are the people who actually will take btc and spend them in the community. Most ASIC miners are in it for speculation/investment. And they will just sit on their btc. Which is bad for the system.
The more people we have actually using btc for everyday purchases the healthier btc will be.
The Question is, how many GPU miners would not buy ASIC hardware? I think very lot.
My PC uses 125w idle, with 99% GPU uses ~240w, Different is 115 watt/h.
For 24H running 2.7 kw. With 300 MHash/s i earn 0.0072 BTC / 24H, this is 0.54 Euro. My power cost is 0.23 EUR/kw.
0.621 Euro power cost and 0.54 Euro BTC earing. That is -0.081 Euro pro day.
This not worth it to mining with unused GPU time.
I think, lot of ppl would stop mining with BTC, many hundreds, and when they stop mining, they stop use BTC too.