Delisting the eagle does not mean that it is invincible. First, although eagles are doing better in general across the lower 48, they still haven't rebounded to historical levels. There are still far fewer nesting pairs today than there were when Europeans first arrived in America. Second, eagles still face a variety of threats. For example, in the Great Lakes region eagles are threatened by mercury poisoning, because mercury levels are very high in the water and thus in the fish that eagles feed on.
Habitat destruction is a big problem for many wildlife species, and the bald eagle is no exception.
Bald eagles are very sensitive to human disturbance, especially during nesting season, so human activities like road construction, drilling, or timber harvesting have the potential to have a negative impact on bald eagles if they occur in sensitive or key habitats. As a Fish and Wildlife Service biologist, I was often responsible for managing these kinds of threats. Sometimes we had to halt or postpone projects until after fledgling bald eagles had hatched and left their nests. Even wilderness recreation can pose a threat to eagles, if, for example, hiking trails pass too close to nesting sites. So we can not forget the eagle and assume it will be alright.