Lol... difficulty is not the same, 100k vs 300 k. Hashrate is about 8-9 TH vs 24. FPGAs were not the target, more the asics were and you can clearly see the difference.
Difference in payout from mining is huge for a gpu rig now vs before.
Only issue i see is that people went with their hash on f2pool for the most of it 30-40% almost and that could raise some risks if it goes over 50.
Where did you get the 300k difficulty?
Are you comparing the difficulty shows this last month?
FPGA and ASIC is already mining since January like the FPGA community already tell us since march that they are mining RVN with FPGA.
I don't see any difference in payout the amount still the same, unlike last year that you can get more rewards compared today. I believe there are many FPGA and ASIC mining RVN with new Algo. Since it is just a program anything from a program can make a new way to mine those coins.