I think the trend among some to dismiss the wild side of the AT is unfortunate.
By perpetuating the false image of the Trail as just some kind of suburban park, all sorts of encroachments become more palatable. Whether these be sounds from a race track, over-engineered shelters, or construction within the view shed, what's the big deal? After all the AT is not a Wilderness!
As for Trail Magic, that's a tough one. Apart from the often discussed distinction between preplanned magic vs. spontaneous interaction between strangers, I think other factors come into play. To my way of thinking there is a big difference between a local coming to the AT to greet people passing through his community (or back yard) and RickB traveling hundreds of miles to the Trail to find hikers in the middle of their walks. Both might be preplanned, but I see them as worlds apart.
I also think that the sheer quantity of preplanned Trail magic is important to think about. Think of it this way-- if there was a hotdog stand and group of great people sharing stories, cheering you on and giving you stuff at every road crossing, that would really suck, right? Even thought its at a road crossing, right?
While that's something we will never see, the fleeting thought that an ever increasing number of hikers might think that would be most excellent worries me.