Try to think of this from the point of view of a monitor manufacture and not a VN v AMD. You have a free open standard with industry backing and a proprietary with licencing fee's.
I am thinking from the view of a monitor manufacturer, i want to sell product so i need to know what my potential customer base is - these are premium gamer monitors anyway so my market is niche, adaptive sync is supported by a handful of cards that have had a small market share for 1 year, gsync is supported by a full range of cards spanning the last 3 years and had leading market share
My potential customer base for gsync is approx. 6 times larger, before you start drilling down in to prices people will pay, the type of monitor gamers want to use etc. Of course the smart money would be to back both, but i'm probably going to err on the side of the tech with the biggest market potential.
Now, LG and Samsung are being sensible in that they are adding it to already premium monitors that are a newer type, no bog standard 1080p 60hz, so they can absorb the cost.
It will be interesting to see how things develop, but when people say things like gsync is automatically dead, nvidia will have to support adaptive sync, freesync will be in every monitor - it isnt that simple. It could happen if Intel support it because suddenly your potential market is ten times larger, but even then i'm not sure non-gamers will have any interest and i dont think AMD have the clout to make it stick on their own.
Thing is, nvidia did even support generic 3d screens via 3dtvplay as well as having their own 3dvision... yet there are no generic 3d monitors still on sale, only 3dvision.
This also doesnt automatically mean freesync is doomed, but it does highlight the challenges.