That’s a pretty long list of hypotheticals.
My view is that none of it happens. You no longer need a wire to your home to enjoy the internet. If ATT and Comcast jack up their prices for their shitty service, give TMobile an extra 20 bucks a month and just use your phone’s hotspot to connect. Most people can do this today, they just don’t know how, and because they don’t know how, they spend an extra 50–100 a month they don’t need to spend for internet connection.