It definately can be done, and is done on a regular basis HB. Of course it requires expertise and resources as well as an understanding by the authorities (who may tend to take a simplistic "hands off" attitude) that where a seriously endangered species like the leatherback is concerned, human intervention will be absolutely necessary to prevent extinction. If I recall, hand raising the hatchlings til they are about a foot long will raise the odds of reaching reproductive age almost 100 fold. These little tykes are simply too easy a target for too many predators.
Having said all that, it is still very cool that so many hatched and at least have a chance, however slim.