Let's do the math for a minute: How high would the Bitcoin price have to go that mining with such a GPU still made sense, if we assume a constant price of BTC? If I had to make a guess... I think $30k maybe?
Assuming the current difficulty of 40300030328, 1 GH/s mines 0.00001248 BTC per day. The most efficient GPU I could find uses about 0.333 kW per GH/s. Assuming a power cost of $0.10 per kWh, 1 GH/s costs $0.80 per day.
In order for the GPU to break even, 1 BTC would have to be worth $64,102.56, so $30k was not a bad guess.