There's something to be said for trying to stay alive, with the hope of being able achieve the life we want (and getting that opportunity, even though it may depend heavily on people and legislators having the compassion to reject and fight against discrimination). Being TG may be the primary thing in life for a lot of people, but it is not the only thing, either. There are lots of everyday losses, victories, and mixed results that add dimensions to our lives, and the positives can sort of grease the gears a bit. Besides, a lot of people have "staying alive" as one of their values, and allowing oneself to die or waste away goes against it.
ENDA can change the math so that TG people will be more likely to live their values. While discrimination will not disappear entirely, it can discourage the practice enough that trans people are more willing to take the risk (getting fired for being trans, which will remain destructive but become less likely) for the reward (being honest and being themselves, which remains as valuable).