I would tend to agree with this. I also have a unique perspective, in that, I've already have a deficit to start with. Being born paralyzed, I've never known what it's like to walk, so if I lost my hearing, I'm not sure I'd react. I'd adjust, but still think I'd miss what I didn't have.
Ultimately, though, being deaf is NOT the worst thing that can happen to someone; even late deafness. It's all about perspective, I think. Each person WILL have a grieving process and a sense of "What the heck do I do NOW?" But, if that person was ME, I'd figure out what I needed to do and I'd do it.
You can look at a situation either being half empty or half full.