A99bis: This is never made clear in the rules as far as I know. In general, since 'race' and 'template' are two separate entities in the rules, I believe it is more RAW to treat them as separate things. So dragonborn would not remove template abilities. Of course then there are questions about what happens if the base race changes in a way that makes the template no longer legal or what happens with a template with a variable LA if the base form is no longer the same. (Half Ogre from dragon magazine). Who knows!