AT&T has every right, I suppose, to attempt to maximize their profit by trying to get the FCC to use the power of government to change the playing field. I would hope the FCC isn't foolish enough to agree to it, however.
Unfortunately, government likes power. The FCC, having recently orchestrated the death of analog television, is probably feeling a bit cocky, that they have the duty to kill all the old technologies. The two cases are different though.
Analog television was not something that people's lives depended upon. It also was very obviously taking up bandwidth that was in finite supply. These things are not true for POTS. It's time will certainly come, but we're trying to move too quickly, for no reason, on the very flimsy premise that "more people could get broadband faster",