I don't know where they will go next but so far my 6 x GPU rigs with Radeon RX 570/580 are still making 0.0012 BTC daily each rig and this for me is still a good amount, if you like me will save at least 50% of the coins mined for a really long term. For the moment though the GPU-mining sector is in another boom stage, a RX 580 Sapphire Nitro+ Special Edition costs about 500 EURO here in Italy.