I have just chatted with my friend from TM and he revealed that TM is now testing a new technology called VDSL2 Vectoring. With this new technology, existing copper cables throughout nationwide will be capable to reach 100 Mbps. This new technology has already taken place in Europe and US.

VDSL2 Vectoring is noise-canceling technology. It cuts out all of the noise, or interference, among the VDSL2 lines in a bundle. With no interference, every VDSL2 line can operate at peak speeds, as if it were the only line in the bundle.

So we are looking at new Streamyx plans with 30, 50 or even 100Mbps!

no, they don't provide UNIFI 50Mbps package for high rise building with copper.
u can do nothing about it.
btw, u and your neighbours may try to talk to your building management office to upgrade the infra of the building from copper to fiber optic.