Technically, this is already done affordably by the Cable TV industry. Fiber is run to the neighborhood loop, and the homes are served via coaxial cable and DOCSIS to 100 megabit.
I have Verizon FiOS and the cable that is run into my house is exactly the same as my old Cable TV service. The "FiOS" modem in my house is exactly the same modem given to me as a Cable TV subscriber.
My old Cable TV service has speeds competitive to FiOS up to around 100 megabits, but for less than 1/20th of the cost that Verizon spent building out the FiOS plant.
And, today, DOCSIS 3.1 will allow the same speeds as FiOS over the copper Cable TV plant. The old and already existing Cable TV plant gives customers the same speeds as FiOS for 1/20th the cost that Verizon paid for building FiOS.
This is why Verizon is not building FiOS anymore and sold off a few regions to other companies. They're only building out Washington DC because they were forced to. Verizon will not see dime one for 25 years. Fiber-to-the-home was a mistake and they admitted as much.