"11M G.fast subs/year in 2021 predicted by nbn/Ovum" was my original headline. After reading the report, I saw no way to be so precise five years from now. There are too many unknowns. Ovum sees only 330,000 in 2017. My guess for 2017 would be higher. Technicolor has an order in hand for 100,000 modems, probably used in VDSL mode until G.fast is ready. AT&T is passing 3M homes a year with fiber and/or G.fast. They are being coy about G.fast but see large savings likely. BT is passing 140K homes in the first half of the year, then ramping rapidly to 3M/year.
SK in Korea will be in a race with Korea Telecom for the 9M homes in the country that need upgrades. KT is promising to offer G.hn at hundreds of megabits to 95% of the 9M by the end of 2017; SK can't afford not to move quickly. I've 12 countries on the G.fast map with firm deployments. Over 60 more are in trials.
Most of the planned builds will still be ramping late in 2017. A modest delay could easily push subscriber adds into 2018. Data for 2019-2021 are highly speculative.