Recent difficulty spike is related to KNC miner.
They are shipping their Neptunes now.
I choose not to panic.
In the case of the Bitcoin network exponential growth won't last forever.
And after KnC is done shipping Neptunes, they will deploy them in their second private mega mine. And then the next rise will be caused by a flood of asicminer gear, then one caused by 28nm Antminers, then one caused by 28nm Bitfiry's, etc, etc. Its not gonna stop anytime soon, and by the time exponential growth does stop, your crytpx shares will look as worthless as a 200MH/s FPGA today.
This project will continue to be around. Let's see where we are in 24 months.
Lol. Make that "2-4 months".