Knowledge is doubling on the planet every seven years. Knowledge workers will proliferate. It is also not clear whether or not professionals and their organizations, and blind individuals and their organizations, will make benefical decisions, even if they sense that something needs to be done. It is not clear which changes in biotechnology and communications will be the critical variables that upset power structures. It is also not clear how fast these changes will appear.
Slower change allows for adjustments.
It is not clear whether the problems of the third world will outpace and overwhelm the technologies of the modern world, or whether technologies will improve the lot of the poorer nations. The degree to which the split between the techno haves and have nots widens is critical. It is not clear how intermediate technologies will affect the near future. I call these cyborg technologies. For example, we may not be able to clone eyeballs in the next twenty years, but science may give us vision substitute systems that change the way we teach or eliminate the blind field altogether.