>"But governments and corporations won't let that happen!"

That argument cracks me up a little. Once the tools are in the hands of the public, they won't be so easily controlled. History has shown us time and again that when you put technology out into the public, it's quickly re-purposed, modified and jail-broken. The potential for molecular scale factories is just too great. Billions of people will want to see that technology freed up for the good of humanity.

On one hand it represents a huge, existential threat to the survival of the Earth and everything on it. On the other hand, it represents the greatest technological advance in human history with the potential to free humanity once and for all from poverty, starvation, misery and even mortality. This tech will absolutely not be controlled by any one company or entity. People will want it for themselves and at the lowest possible price - ideally, free.