Glad to hear your input on this. However, I will say that there are enough people in the world these days to support anything as long as it is good. The excellent delis out there, the few that remain, are packed as long as they are open with people young and old. Hell, even the pitiful ones are. Boston for example has a bunch of really crappy jewish style deli’s that have em lining out the door.
As I have said, I am part of the young generation and I am in excellent health, I eat meat all the time, and I exercise faithfully. Anything in excess will harm you.
And I am not saying you do this at all, but for many people who eat a salad, it is almost worse for you than a corned beef sandwich. I see tons of people that order salads and slather them with creamy dressings, cheese, and croutons that are basically fried in oil/butter. Not exactly healthy eating. Again, not saying you eat unhealthy salads, just that I see this more often than not.
Finally, the thing about a good, traditional jewish deli is that the menu is so varied you could eat new things everyday. Its not just cured meat.