To be honest, there are too many types of dragons already... and I suspect the majority of WotC game staff don't like psionics.
That sucks that they hate psionic, also, I both agree and disagree with the whole too many types of dragons things. I believe ALL they need is the chromatics, metallics, and gems, nothing else is needed. And they only need the original five dragons of each group, and only FOUR, three if you count IO as dead to create the other dragon gods. Thoughs are the only dragons we need.