I don't see why not quite frankly. I think that the idea of dragons is far more believable than the idea of the christian "god". The way I see it is that there had to have been some form of larger lizard in the past, linking to the theory of evolution. Smaller dragons that exist now could be derived from the "dragon" physical conception, the same way that alligators come from giant versions and elephants from larger mammoths. It makes sense to me.
Spiritually, I can see where you can get the perception that it is a valid belief, and I give you points for its origianlity. Also, to some degree I agree with you. There are chinese and japanese myths and stories regarding dragons frequently. Such as protectors of rivers or forests, its not difficult to think that they have left this world completely. The astral plain may not be their location though because I have been there several times and have never seen the physical image of a dragon although there are dense pockets of energy which do not ever take a true form.
I think its a wonderful belief, good luck with finding other explanations. Hell, dragons make more sense than the "God" so many believe in. At least to us. Nicely written and well explained!