Its hard for me to say. I think that is the realm of a psychologist. But, if I was to guess, I think perhaps exposure combined with me being forced to deal with the fear using rational thought. I doubt the process that causes the fear will ever go away, but what I am learning to do is find ways for me to manage it, rather than letting the fear manage me.
BTW, its this fear that is holding me back. It took me just over 30 hours to solo, and its going to take me a lot longer than most to get to that point where I am capable of doing my GFTP check flight. But one thing I am more adamant about than my FI's, is that I need to be comfortable with it all, even if they deem me competent. I wont take that check flight until I am happy with myself.
Great article BTW.