ILEC Rosetta Stone
Here's the deal.
LEC's like Verizon are driven by their wish to be a de-regulated business. Once you understand that basic motivation it becomes the Rosetta Stone by which you can decipher much of the seemingly irrational actions.
For instance, poor DSL customer service drives customers away from the regulated side of the business to either the cable "competition" or their deregulated LTE service where they can charge any price they want.
The rush to abandon copper isn't driven by technology, it's an effort to move away from regulated copper to the de-regulated glass or wireless.
Hope this helps.