This is the sign of game over!
Maybe, maybe not. It's a sign that btc:usd is down. If btc continues down, then that bonus erodes. Now, that margin is precariously thin.
Take a look at the pm market. Thats getting smacked as well.
The usd is "strengthening" with downtrend in us unemployment, and there is no sign of inflation despite fed low interest policy. In other words, the spec trade is off. People will roll usd into equities or remain in usd going into the gift giving holidays.
Btc is volatile - it might go up. I suspect it will flatten or go down for the remainder of the year, but that's just me. At the end of the day, btc mining is too cheap and easy at this exchange rate. A shake up will come to marginalize devices like the antminers. Home farmers are just about done, but hopefully labrat has sufficient optimization.
If people want btc to go up, they should buy some btc, to absorb the otherwise cheap and abundant supply.