The world has always been able to find balance during diversity for millions of years. Mankind is the only species that has the power to disrupt this natural balance. Do you believe humans are capable of finding and maintaining balance? Or are we destined to fail?
There's no profit in complicated solutions. We have the technology to engineer artificial "meat", but it's cheaper to flatten forests and raise cattle. As such, a handful of people will find the next 50 years very comfortable, and everyone thereafter will die for their greed.
This song has played before.
The majority of people will fail most of the time. Thankfully we have those non-corrupt leaders that point people back in the right direction(IE Mother Teresa, Ghandi). If we have a lack of these for an extended amount of time, we are screwed, people will forget what keeps us going, and people will forget the basics of life and how to rely on little and low technology and still be comfortable and happy.
Humans managed to live symbiotically with the natural balance for tens of thousands of years. The difference now is that population increase, as a response, but also dependent upon agriculture and industrialization, has tipped the natural balance towards short-term gain over sustainability.
It is not inconceivable that humans could return to a relative symbiotic balance, but it would require population decimation and the forfeiture of modern comforts. As is, we seem rather destined to fail. I give it 100 years.
(As an aside, current population projections threaten the human species in additional ways. With people living in such dense proximity, the right strain of influenza would have no issue halving the population of any given continent.)
Don't blow your own horn too much, DrWho. Humans aren't all that special. We've just reached a point at which our weighty cerebral cortex is detrimental, rather than advantageous. It's happened to thousands of species before us (not the unprecedented cerebral cortex, but rather an evolutionary edge that outlasted or outgrew it's use). Call it Tall Poppy Syndrome, if you'd like.
We'll die, and things will go back to the way they used to be. Like I said, this song has played before.