You're not going to "die" of depression. You may take your own life due to the consequences of depression, but there's nothing from having depression physiologically that will kill you directly, not in the same way a heart attack will kill you. ?
I understand what you are trying to say...but it's wrong. Suicide is the 10th leading cause of death worldwide, and will kill you just as well as an MI...assuming you do it right, which over 1 million people do each year.
There is also a STRONG argument for most depression being a physiological problem, as there are many studies showing a greatly decreased risk of suicide of depressed patients are placed on anti-depressant therapy (currently, usually an SSRI to increase the amount of serotonin in the synapse, leading to upregulation of the post-synaptic receptors.)
Regardless, my point is more that it doesn't matter so much HOW you die. A person dead of a Stroke is just as dead as the guy who put a bullet in his head.
This is also neglecting the issue of violent crime which is also a leading cause of death. Psych, and particularly child psych, do a decent job at decreasing these rates by treating the psychotic with anti-psychotic drugs (also a physiological problem...this time, Dopamine mostly).
To answer your question: look around you. Do you see tons of parents doing a great job raising their kids? Or, do you see tons of kids who grow up abused, neglected, or just out in front of a TV all day to watch Spongebob? I see tons of kids (and adults) with grandiose dreams of being famous, which aren't going to come true. The next generation is going to have a pretty severe crash in self-esteem, goal oriented behavior, increased rates of ADHD, autism, conduct disorder, etc. And they are going to grow up to be really messed up adults with even more messed up kids. Go watch Idiocracy. Maybe I'm just a cynical pessimist, but we're only a few generations away from watering our plants with Gatorade (it's got Electrolytes!)
Psychiatry isn't going anywhere. In fact, I predict a bigger shortage than expected due to people having more pathology than expected. Look around.