Beginner Gardening: Is this Prayer Plant doomed?, 1 by Vertigo79

Vertigo79 wrote:
The next morning, those edges had deteriorated with the black "creeping" down the leaf. I used a sharp knife and trimmed the entire plant back to it's bottom stems and continued monitoring it. A few days later, I started showing some new growth, but as you can see from the following pictures even the new growth seems sickly.\

Is this guy a goner? If he can be saved, what course of action should I take?