If customers aren't going to buy the new product - and they don't, as Verizon has proven for 6+ years, it doesn't matter what cost efficiency it yields.
FTTH has been around for less than a decade and nearly 9.7 million of the 22.7 million homes it's marketed to in North America have bought it. Most people would consider that a marketing success rather than a marketing failure.
If fiber is the second coming, why isn't the take 100%? Considering the CAPEX requirements and this potential savings in ops, shouldn't we as a nation/society require 100% fiber service when/where it's deployed?