After taking a class on health care delivery in the US, I would have to argue that the greatest need in medicine in the future is going to be geriatrics. We (society) are completely unprepared for the aging of the baby boomers. For example, less than 5% of people have saved for retirement purposes. Average cost of a nursining home for one elderly person is about $34,000 a year. This is quite expensive (just like med school I guess, except they just hang out and do nothing). The health care situation (in the US) is a ticking time bomb. I dont know if geriatrics is a speciality yet, but I can foresee one; and why not, there is a specialty called pediatrics?