This morning I was having a particularly vivid dream, and at some point in the middle of the dream I started to become slightly lucid. I started to hear the Inception "bong, bong" music and this made me say out loud, "if I'm hearing that music, I must be dreaming". And did I go on and become fully lucid? No, I got sucked right back into non-lucidity a few seconds later.

This is obviously just one anecdote, but it illustrates the main problem with the notion of becoming lucid within a dream: even if you manage to get some tiny bit of lucidity, it's a steep uphill battle to maintain it. Unlike a WILD, where you start the whole process in reality, and hence are grounded in reality, a DILD starts in non-reality, and is "grounded" is non-reality. The momentum is so clearly in the wrong direction that you can literally say out loud "I AM DREAMING RIGHT NOW", and still not become lucid. Anyone who has faith in DILD obviously doesn't understand this.

/end rant