I'd totally be up for buying one of these new AMD cards if I wasnt locked into buying NV for G-Sync.... really woulda loved to have supported them this time around!
I can sympathise with this issue because when I bought my Freesync 4K IPs monitor I knew I would be locked out of Nvidia. Though I had always knew that Nvidia locking out Freesync was a driver rather than hardware level because VRR is part of DP 1.4 specs. The VRR battle was won by Freesync (VRR) because people voted with their money, £100+ for G-Synch tax was just too much for most. This is proof that if people vote with their wallet then Nvidia have no option but to follow the money.