I'll check the prices and then reconsider the investment. I'd be so sad if it didn't work out. Maybe if all you guys quit mining, the difficulty would go down far enough for me to make profit? GO! 
At which point the profit would bring in enough new (or previously idle) miners to raise difficulty right back up.
If you are the marginal miner then you are always the marginal miner. Last in and first one forced out. It doesn't mean you can't mine it just means be smart about it. The higher your electrical costs the more the higher cost but higher efficiency of FPGA makes sense. An FPGA miner is almost guaranteed to be the most efficient miner so while profits may be lower you have much lower risk of every being forced to quit.