I'm sure it's been said already, somewhere but the optimism of curing all disease through these techniques is misguided. I'm British. I live in a country with a healthcare system. We are treated for conditions that would be fatal and in other countries, at a cost. In most other countries, such healthcare is not affordable. In many countries what we, in the UK, consider a curable illness, is a death sentence to somebody in a country where they cannot afford that healthcare.
So, the point of the above statement is that this technology will be driven by private, profit-making industry. It will not be delivered to the needy but to the wealthy, those that can afford such treatments. And in many cases, wealth is not associated with productivity. I don't even need to say, life isn't fair to justify that. The future of healthcare and radical new developments in gene therapy will not benefit humanity as the optimists see it. It will be opposed by the conservative religions as tampering with God and opposed by the neo-leftists for creating unequal societies, and I guess, placed out of reach of many by profit-seeking companies. Hey, it's just like Deus-Ex.
As for space exploration? Same thing. Only the wealthy get to leave earth. There's always a pattern in human, environmental evolution and its design is always contrived by commerce.
Strangely, there is one caveat to this and it is China. I believe the political doctrine the nation ascribes to tends to follow 'what is good for the many...' and in that respect, it, as a government could roll out mass genetic manipulation to cure disease (as disease takes the natural resource of a human away from the productivity of a nation). It would be ironic, if, in thirty years time, China is free of disease, due to such an arguably Draconian approach, while the ideological commerce of the West is still riddled with easily curable but costly illness.
And Bones is right, in at least a practical viewpoint. If disease stops taking lives, we will face an ever-increasing struggle for resources, which invariably, throughout humanities entire history, has led to increased conflict and violence. Our way of life would need to radically alter if we are to face a disease-free future. Agriculture, our food preferences, waste management, power delivery; all of these things tie us to a finite realisation. Before we become disease-free and long-lived human beings, we need to sort out the fundamentals of a sustainable existence, otherwise, our future suffering will be tremendous.
Life is always destined to die. It is the one certainty.
I love Saturday morning realism.