Not doomed. I like to think that we're doomed only if we want it; and that those statistics probably express the difference between "dieting" and "lifestyle changes".
Dieting >> something temporary, often drastic, that you stop after a while, thinking "now I've lost the weight, it's over, I can go back to living a normal life". Except that when you stop and go back to this lifestyle a lot of us consider(ed) as 'normal', the weight comes back.
Lifestyle changes >> what's probably closer to 'maintenance mode'. The weight might come off more slowly, but the good habits we gain stay with us, and there's no reason the weight should come back after that. And since those habits also teach us to nip it in the bud, it's easier to stop the weight gain before it becomes 10, 20, 30+ lbs.
Actually I'm the contrary of such statistics that say that when you gain the weight back, you always gain more. I actually regain less. The one time I had regained more was because I had lost it cluelessly at first. The next time I lost, it was through lifestyle changes (learning to like exercising + conditioning myself to like vegetables, among other things), and those habits are still with me now. You may say, alright, K, but you're not at goal. I know. I'm a few lbs above "official goal". But I don't care. At least I haven't regained the rest, right?
Also, I think part of the "lifestyle changes" is to learn to like food. Real food. (I'm French, I guess it helps?

) I still eat "junk food", but I've become very picky about it. I.e. if I want to eat a croissant, I'll eat it, but I'll also go to lengths such as finding a good bakery to buy it—none of those crappy supermarket-croissants in my stomach. And I'll buy only one, not a whole pack. And I'll well darn enjoy it, every morsel of it, and then be done with it.

So it's also about choices: ours.