Dave:
*THIS* is probably the most revealing answer you can possibly give, thus far, on the whole ghostball vs. system-based aiming topic. I'm sure *you* realize the impact of what you wrote here, but I'm not sure others have. It's profound.
I agree -- for those that do not have [either developed, or gifted] spacial perception, completely removing this "Achilles Heel" and replacing it with something that is more tangible / calculable (if that's a word?) is going to cause interesting things to suddenly start happening to that person's potting / pocketing ability. (Obviously this is leaving out other things that directly affect that person's proficiency in pool, like controlling the cue ball, figuring out do-able patterns in pattern games like 14.1, One Pocket, and 8-ball, but I digress.)
Here's the reason why CTE cannot be the "be all, end all" aiming system, or the de-facto standard "for all people" -- going back to that perceptive ability of the player him/herself. I'll use myself as an example. You know that whack-a-mole game, right? For me, that ghostball is a mole that pops up at the exact spot next to the object ball to pocket that object ball. It sounds silly, but for me, pocketing a ball is playing whack-a-mole -- except I'm shooting the mole dead-center in the face, rather than hitting him over the top of the head.
So for me, although I've attempted to use CTE, stick-based aiming techniques, etc. (all in the spirit of "what the hey? why not try it" open-mindedness), that mole keeps popping up next to the object ball every time, like... <Pop!> "Hewwo!" (
Elmer Fudd voice). I'd get up off the shot, shake it off, and try again... <Pop!> "Hewwo!" Damn it; get up, shake it off, get back down and try again... <Pop!> "Hewwo!" Ok, I give up. Ok, Mr. Ghostball Mole, I can't shake you. You're an integral part of my game, of my shot perception.
Point being, I can't throw-away what comes naturally. I'm actually fighting myself to do so, to try to ignore seeing that ghostball, to try and take my six senses and reduce them to five. And to be honest, why should I? For me, it's not abstract -- it's right there, in front of my eyes. It's almost tangible -- I can reach out and almost pick that ghostball up.
To playfully plagiarize a quote from Haley Joel Osment in "The Sixth Sense," "I see dead balls!"

(Ok, that was a little dramatic, but hopefully you catch my drift.)
I guess this stems from what I used to do as a kid, when my Dad would take me hunting and fishing in the deep woods in upstate New York state. I'd take a pencil and memo pad with me, because I loved sketching. Because the abrasive sound of a pencil against paper is a no-no when hunting, whenever I saw some scenery or something that I thought would look really cool sketched out on paper, I'd have to remember it -- to freeze it as a picture in my mind. Then, in the car ride back home, I'd break-out the memo pad and pencil, and begin sketching away, permanently affixing the image frozen in my mind to the paper. While my ability to accurately duplicate on paper, with dexterous skills, never could match the details I saw in my mind, the ability to perceive and "freeze" images in my mind has stayed with me ever since. I can't shut it off.
Again, in summary, what works for some people, may not work for others, *precisely* because of cognitive/perceptive abilities. Let's keep that in mind, especially during those euphoric moments (for some people) when CTE is finally understood.
-Sean