I have a feeling it won't be major selling point, and will instead become a standard feature of middle to high end screens that people take for granted.
Exactly, Gsync the must have experience that hardly anyone is taking the plunge, it's been out a year and no ones tripping over themselves to shout about it-apart from the pedantic fanboys.
Overall graphic market share Intel>AMD>Nvidia, Intel is going to be all over A-Sync, add in AMD leaving Nvidia on roughly 16% market share, that's a way higher potential captive audience which is clearly indicative by the amount of A-Sync panels inbound.
A-Sync monitors are aimed at 100% of the market, if you are in the market for a new monitor, next to no one is going to discount an A-Sync monitor in a specific targeted price point because they run Nvidia.
Difference being you are paying a royalty above and beyond the monitor cost with Gsync.