FPGA's boost in hashrate is relatively low than what ASIC's are capable of. With new GPU's coming out this september, we would see another hashrate jump again.
We will have to wait til AMD comes out with their Next Gen GPUs before anything will change in mining.I'm also waiting for the Huge leap of AMD to NVIDIA. I've waited for turing for long but i got disappointed. This Ray tracing thing is being marketed by them but actually had little use at all to the overall performance.