Now about the GPU. All the mining of the GPU is still developing thanks to the Ethereum. ETH is mining 10 to 12 million video cards (roughly). If the reward for the block falls to 0.6 ETH for the miners and the asics are released to the market, this will completely kill the GPU mining. Miners will go on other algorithms and profit will reduce to the 0.
Therefore, asics is a threat number 2 for the GPU of mining, the threat number 1 is the transition of ETH to the POS mining