Obviously not forever, but I think I can keep myself from falling off the wagon completely. I've developed an appetite for much healthier foods and lost my appetite for the crap I used to eat, and I'm not going to stop exercising. While I don't intend to keep it at 500 calories once I hit my target weight, I don't think I'll have much trouble keeping it around 1500.

Good point. My biggest concern is that I do best with black-and-white rules and if there's any gray area I'll end up bending the rules too far. It'd be much easier for me to have a designated cheat day than to increase every day to X calories, but I guess I'll have to live with whatever actually works...