I think G.mgfast is the technology that looks more suited to DP usage, while plain old G.Fast looks more suited to Swisscom's FTTS design (ie up to 200m) for a whole street.
I imagine copper is going to be as doomed as it ever has been: when the installation cost of fibre becomes cheap enough compared with the cost of the most viable alternative. If G.mgfast is no cheaper than FTTP, then it won't happen. As ever, it is a balance of pro vs con, with the financial having a heavy weighting.
I'm also pretty sure that the 330Mbps package will be good for marketing at "up to 300" under the current advertising rules. Getting 300Mbps is something they've been managing far beyond 30m so far.
The problem with ADSL2+ is that it was sold with an "up to" speed that matched the top of its capabilities, but which started to tail off before the copper even left the exchange building. G.Fast has an absolute maximum of around 900Mbps, which would tail off before the copper left the cabinet ... but by selling only "up to 330", they give themselves room to achieve it.
But I suspect we'll see the new regime cut in before G.Fast adverts get any traction.
@Chrys
With your talk about repurposing the fibre that is out there, I wonder if you are under a misconception about what fibre is out there.
As far as I can make out, the NGA FTTC rollout has come with a fibre spine (with lots of strands of fibres), and aggregation nodes that can tap into the spine. But beyond this spine, the only fibre is the stuff that has gone from aggregation nodes to PCPs.
This latter stuff (it looks to me) is empty 7x or 12x blown-fibre-tubing. The tube can supply a number of PCPs; at each PCP chamber a "tube intercept joint" is inserted, that allows one tube to be extracted, and directed up into the FTTC cabinet. The fibre (as a 4-strand unit) is blown from the aggregation node to the FTTC cabinets, where 1 strand is used as a live point-to-point circuit.
With this architecture, the spine and the aggregation nodes are intended for future use - in NGA P2P and PON circuits, and in BAU leased lines. This part looks to be designed for what you want - more fibre without digging up streets.
The other part, sending fibres to the cabinets, looks to have little capacity to "repurpose" into a large-scale FTTP network.