That is what our puppy trainer had us do with Jazzy. I actually took it a step further and tried to teach her to sit on a rug a few feet away from the door when the door was opened. THAT only works sometimes because the rest of the family wouldn't get on board with it.
I still don't trust the open door. I'm not willing to trust that there won't be something that triggers a dash out the door – be it a squirrel on the porch, a loose dog, cat, loud noise, etc.
I guess I feel like there may be times when instinct overcomes training, so I never have 100% trust in the behavior of any trained animal and will always use extra precautions.