Not sure if Rain is also going that route but 5G is going to be a game changer.. From what I read (and the rumours). 5G will be faster than 100mbit constantly. Even talks of over 300mbit true speed. Only time will tell
Well LTE-A is 4.9G so what diffirence can 5G really make. As far as I could see the standard for LTE-A is 1.5Gbps so yeah it's not happening now how will 5G make any diffirence.
The problem is not the technology currently it's spectrum. Higher the speeds the more spectrum is needed which is available but not allocated to anyone.

