Pray tell, how did you arrive at 2017? I ask because the more forward-looking European carriers (namely, FT and DT, and on this side of the Atlantic VZ, as well), at least, have already stated aggressive objectives to consolidate their services in "jumbo hubs" closer to the core by backhauling their end user traffic via fiber, thus eliminating the need to house equipment closer to the customer. This is what enables them to decommission the majority of their central offices as they are used today, although I'm not aware of any precise time lines in any of the instances I've cited above.
It also occurs to me that, by the time copper loops are eliminated as a last mile solution, fiber would still in most cases traverse the same geographical points on the map where those COs now stand. That's just how cabling infrastructure topology evolves over time and establishes permanence.
Hopefully, by that time most end users will be receiving symmetrical services and some of those COs might be converted to local collocation sites for hosting end-user backup and disaster recovery service hubs, content caching and repositories, and, in general, Cloud/Web hosting sites for residential, so-ho and SMBs. In other words, I'm suggesting that Cos could be transformed --not into parking lots, but into collocation centers for end users whose requirements don't quite scale high enough to cost justify leasing cages in larger carrier hotels and collocation centers.
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