In my experience one of the major reasons that scientists have a hard time accepting ki (or chi, or whatever) is that the proponents of the theory always seem to try to equate it with things like atoms, electricity, atomic orbitals, and so forth. I've seen quite a bit of this in books and articles.
Unfortunately the correlations drawn are often based on incorrect assumptions. It is very easy to hear a talk about atomic physics and pick up some of these ideas without having the background to put them in the proper context. Your average scientist who has this background reads one of these correlations and immediately calls the whole theory bunk (on the grounds if some of it is wrong, it must all be wrong).
I do not mean for this to be directed at anybody in particular, and if it is written in such a way that seems insulting, please accept my apologies in advance.