I doubt it. Private lines make moves and changes and maintenance vastly cheaper. My relatives who are trying to sell their small rural telco in Vermont converted everything to private lines years ago. For the few people who still have grandfathered party lines, they tie the lines together at the CO.
Not since 1+7D went away. I think these days you'll find that CDOs are all remotes from modern switches that provide all of the digital bells and whistles. They certainly are around here.
Remember that due to the magic of USF accounting, small rural telcos have an incentive to gold plate their plant. That's why the CO down the street from me has a GTD-5 with two remotes that handles a total of about 10,000 lines.
R's,
John