Yeah listen... not to piss on your parade and all. But you are so optimistic and a bit naive to boot, if you forgive me for saying so.
You remind me of H.G Wells and the Fabian society of the early 20th century claiming that scientific understanding will conquer everything and there will be no more pain, disease, poverty, starvation.
Or Bertrand Russel, claiming that education will forever eradicate ignorance and that technology will make everybody work only a three or four hours a day.
They all left something very important out of the equation. Either that or they tragically underestimated it.
Human nature.
My optimism is basically a determination. When you are determined, you must be optimistic (to a sane degree, of course) and believe in a success (else - there's no point for a determination at all..).
The dissease actually are at all times lowest, and absolute majority of seriuous disseases are a consequence of one and only one factor - aging (it's fascinating actually.. In one experiment, where mice were engineered to age fast because of such a little stuff on DNA strands, called - telomeres, they all started showing classical disseases/detorriation associated with old age - diabetes, heart dissease, sight loss, hear loss, brain issues, etc, etc.. and when the teomerase was RE-activated in these mice, literally - ALL these disseases "winded back" to a non-existant state. That says a lot.. It's very predictable, very interconnected, and fighting each dissease as a separate "unit" will be shown futile, as the cause is really on a cellular level, the loss of a genetic phenotype we call "youth" aka - perfect, or almost perfect health)..
And talking about "everybody", that's - utopia. I mean - we can easily manage infection or common cold, BUT - plenty of people still die from these in third world countries.. Just because there's a "MB slr" on sale, it doesn't mean that everyone will be able to buy it. It's the same "survives the fittest" principle. Plastic surgery can make quite some wonderful stuff these days, but far from everyone enjoys the fruits of it, even tho' many would like to be able to afford.
By the way - mind I tell you that there are species that doesn't age? Simple as that - they die of everything, but not old age, they doesn't have any "time limit", that's ticking. They may be eaten by a predator, cut by a glass or poisoned by humans, but they does not detorriate like we..