There is a theory that goes along with this technique. It is only a theory - like any theory, I propose it in hopes that it may be proved or disproved through our effort and experience.
The theory is that all of our non DILD techniques are nothing more than experiences we are having when already asleep. In other words, a WILD is nothing more than us dreaming about successfully transitioning directly from awake to dream, and that it only really works when we are ALREADY fully asleep. Our intention and preparation are incubating a dream. We then dream of success. . . or failure. If this is true, then there is likely no such thing as a WILD. WILDing may really be just another form of DILD, different only in that we are convinced we are awake at the beginning of the exercise. If this is true, then "successfully" WILDing becomes irrelevant.
The trick, of course, is to remember this possibility and find another way to figure out if we are awake or not - to test our state of consciousness when we think we are laying there awake, waiting for something to happen. Perhaps many of those wasted hours of seeming to lay there awake, waiting for transition, are nothing of the sort - and are opportunities just waiting for us to exploit.
Consider two of the oddball WILDing techniques that have seen some success; the FILD and Reverse Blinking methods. Both of these are similar in that they require testing for dream state without expecting a transition.