While we're at it why don't we just solve aging, provide infinite food supply, and eliminate predation for deer. That would be a great idea right? No way that would have any negative side effects, right?
http://www.nickbostrom.com/fable/dragon.html
"Once upon a time, the planet was tyrannized by a giant dragon. The dragon stood taller than the largest cathedral, and it was covered with thick black scales. Its red eyes glowed with hate, and from its terrible jaws flowed an incessant stream of evil-smelling yellowish-green slime. It demanded from humankind a blood-curdling tribute: to satisfy its enormous appetite, ten thousand men and women had to be delivered every evening at the onset of dark to the foot of the mountain where the dragon-tyrant lived. Sometimes the dragon would devour these unfortunate souls upon arrival; sometimes again it would lock them up in the mountain where they would wither away for months or years before eventually being consumed."
Over the past centuries, human life expectancy has increased greatly and yet we have a much higher quality of life. It's an extraordinary claim to suggest that the continuance of this already-existing trend is 'almost guaranteed to be a disaster'.
Also, if you count only people who reached adulthood and eliminate early deaths from injury which were common in adults between 25-45 yrs old, life expectancy and height are only now catching back up to the paleolithic.
Who is we?
I don't what comments you're reading, but as usual with topics of this nature on HN, the comments are sadly negative.
Birds are also the only ones that should be flying.