So the ATC should take over management in The Whites even thought the AT only uses a small portion of trails that are actually in The Whites? no way...there's far more trails and areas to maintain, protect and keep up than just the AT up here in The Whites. There's far more people hiking up here in The Whites than hiking on the AT in a given year too. I don't agree with everything the AMC does, but I will say that the organization as a whole keeps these mountains and trails in great condition for everyone to enjoy, from the dayhiker to an AT thru-hiker.
And to those saying the AT is hard to follow up here in The Whites, you just have to be able to read signs and a map truly, which is true backpacking. The trails in the Whites have been around way longer than the AT has, so they weren't going to be re-named just because the AT traverses over the same trail...