Yes... I think my area are capable for Unifi via VDSL....
As you see in UK, their ISP (British Telecom) recently launched a new next generation broadband called BT INFINITY...
They just lay a fiber from the exchange into the nearest "green" cabinet at the residential areas... That technology are called as FTTC (Fiber to the Curb) and it is delivered via VDSL.
Same case goes to Unifi, but VDSL technology will are just used in the high rise building where the fiber will be terminated at the small exchange in the basement of the building.
For the BT Infinity VDSL, BT said that there are no speed cap... Your speed will be totally depends on the quality of your copper cable from the "green" cabinet into your house. Maximum speed that can be achieved is about 40Mb/s for download but slightly lower upload speed which is about 16-19Mb/s...

I think it's really possible for TM to implement Unifi for the not-so-called "high economic impact" areas via VDSL technology....

Just my 2 cents....