Anomanderis, where you say that our subconscious mind chucks us out of the dream when we become conscious.

I tend to disagree. I had lucids in the middle of the night and slept till morning. Also I had lucids were I maintained Lucidity the entire dream.
Why most lucids are short and we are quickly awakened uppon lucidity is because of 2 reasons I believe:
- Getting over excited, releasing a mayor dose of Adrenaline, and
- Getting Lucid as we are about to wake up anyway since our consciousness is then naturally slowly awakening.