I can imagine an A.I. dragon would be difficult to implement, at least at this time.
I think the AI is there already but needs a lot of tweaking. If you remember past KS about DC, one of the last seconds of the video made the dragon move back and forth like an idiot.
The only thing I'm concerned when the AI has the dragon form is when they could build the units. I do hope they couldn't build units because it is very disadvantageous for the player if he can't build while the AI can in dragon form.