JMHO - but POTS will get eventually get upgraded to fiber (Verizon FiOS, etc) but us more "rural" folks will be on copper probably another 100 years
Fiber will go into the denser areas, but the problem comes in for areas where farmland is sold and carved into 3 + acre lot communities (like mine). A 100acre farm that only had one phone now has to support 30. Still not worth running fiber, so they cobble more stuff together on the antiquated, overloaded, POTS.
When we moved in -newly built house - had horrible phone service. Noisy static and even some party line action. Twelve service calls in two years and they could resolve it. Dial-up was useless (went satellite). Paying $50 month plus long distance.
Surprisingly, a couple years later, cable rolled in - so I switched to VOIP. Not the greatest, but better than the phone company and half as much
So my take is telco and all other broadband companies will essentially become the "phone companies". That's why Verizon has the big fiber push going and everyone is jumping on the VOIP bandwagon
What I am curious to see is how broadband carriers handle VOIP. I have Comcast cable broadband, but use Vonage for phone. Now Comcast offers VOIP and tries to get me to switch. Since they own the network, I am curios to see if they will try to "force" me to switch to theirs.
Should get interesting - could be very competitive, which should be good for all. But the concern will be for folks that don't get the broadband capability for a long time. It will create a serious gap.
Sorry for the ramble - just my uninformed perspective