The difficulty auto-adjusts to keep supply constant, so market forces will drive the cost of mining a bitcoin to just below the value of a bitcoin. Hence, ASICs

The difficulty auto-adjusts to keep supply constant, so market forces will drive the cost of mining a bitcoin to just below the value of a bitcoin. Hence, ASICs should have no major long-term effect on the difficulty of taking over the network. Arguably they'll even make it a bit harder since you'd need specialized hardware, and couldn't just buy up a bunch of GPU EC2 instances on a whim and take over the bitcoin network.