Well, I'm all for better birth control, Ken.

But to take an 'on the other hand' tack, I do think there is value in allowing even clueless and destructive hikers access to trails, because (studies show) people who've had some kind of outdoor or wilderness experience, even if it's only a few times, are much more likely to vote to protect it. I also think that sometimes, clueless and casual hikers turn into more careful and serious ones. In my view, the real threats to wilderness come from development and fossil fuels. The pink plastic ribbons are upsetting, but small potatoes compared to what global warming can and will do to these mountains. So ultimately, I don't want to restrict people's access to wilderness too much, even when they're jerks.
It's certainly true that, barring the employment of a dozen guards who patrolled up and down Skyline 24/7, there's no real way to stop people from going up SKyline whenever they want. However, I don't think it's necessary to stop every errant hiker--just control them more. Continuing with the 'herd' metaphor--I think only some general 'shepherding' of the crowd is in order. Permits would be annoying, but it would be a possible way to regain some control. Also, as I mentioned in my other post, I think it's necessary for some entity, either public or private, to take 'ownership' of the trail and indicate to users that someone is in control. I think part of the disrespect hikers are showing on Skyline--i.e. massive shortcutting, litter, graffiti, trail-markers-- is because they don't see anybody in charge.
Like almost everything, it all boils down to money. A permit system and rangers patrolling would solve or at least control the problem, but would certainly cost a fair bit of money, and as we know, the state parks are hurting financially. I don't know how the BLM's finances are, but I doubt they're rolling in money either. Of course, I think the money would be well spent, but unfortunately, our legislators don't seem to agree.
Q: How many therapists does it take to screw in a light bulb? A: Only one, but the light bulb has to want to change ...