The profit has not hurt because it created ASIC which secures the network. Of course we are going to see a massive contraction in ROI and a lot of disappointed people who aren't getting huge returns or even recover their initial investment.
It will be interesting to see what happens in the next 10 to 12 months. There seems to be lot of money being thrown around towards asic projects. The number being thrown around don't make sense for the amount of potential return in the future.
There is no getting around that the network is self adjusting every 2016 blocks, and as the network grows larger, the 2016 x 25BTC shared during that macroblock interval smaller per hash.
I agree the network is going to be very safe in the near future and there will be lot of disappointed miners/investors. I am most likely going to be one of them