Don't let att touch it. I hate them and their internet with a passion. I'm stuck with them and only them though.

Other countries don't need to adopt it from USA (if that is what you meant) since other countries and the providers there use or try it already in some ways. G.Fast is a standard and not a product, all the big providers like Deutsche Telekom, France Telecom, Vodafone and so on are already into it. 

I'm just not sure if it is already really used in some towns around the world but yeah, the huge companies "have" it already since years and try it out. 

Here are the problems with that tech so far.
1Gb+ speeds are only good at less than 100 Meters.
500Mb needs to be within 100-149 Meters.
200Mb needs to be within 150-249 Meters and so on.
150Mb needs to be within 250-500.

These distances are based on G.Fast hub distances and between the hubs there will still need to be fiber.
The cost savings is to not have to have Fiber to home and instead put a hub on basically every couple city blocks and have fiber go between the hubs. There still needs to be massive fiber infrastructure for the quoted speeds.

Another issue is there is a limitation for the impedance of wire at the home. If your home is old enough or there has been enough degradation on the line it will not be possible to get the quoted speeds.

It is always good to see potential solutions to existing problems, I just don't think this is a viable solution and is not future proof.

This technology is already a few years old and about to be implemented in Germany as well. However it's about as much of negative progress you can make. Improving existing copper connections will slow down the laying of optic fibers. Which is why internet providers love this technology and everyone else hates it. It's a progress that's actually slowing down progress.

Well, i actually thin G.fast makes totally sense as a gapfiller. It's a got a pretty short range, but it's good for FTTdp which could later be enhanced to FTTH.
G.fast is where we should be by now though.

Just in time for Netflix on the Neo and Scorpio.