I think that this idea has the potential to be very appealing as a marketing tool. As someone who does pay a lot of attention to what I eat for health/weight loss reasons - there's something lovely about the idea of "just order that and it'll be exactly what you want". Kosher has essentially found a way to do that. Through the process of certification, a kosher person can see the certification on the wall and can completely turn off that part of their brain. And in terms of creating a relaxing dining experience I could easily see that applying to a meal being healthy.
That being said, I also really like eating out and while I try to make smart choices - part of those smart choices are acknowledging that when eating in a restaurant that is highly likely to be the less healthy meal of my day.