But we are now entering a new phase, of what Hawking calls "self designed evolution," in which we will be able to change and improve our DNA.
I missed the part where Hawking explains how the entire human species will have unrestricted access to this technology, how natural selection will be universally and permanently mitigated, or how humanity manages to make this technical innovation permanent even in the event of natural disasters, wars or other unpredictable upheavals.
I will start by saying that I think RAMA's notion that technological singularity will happen in 50 years is all but excluded - indeed, the notion that the technological singularity is possible at all, given the psysical laws of the universe is in serious doubt (and is closer to being disproven that proven).
These being said, the argument you just presented, newtype_alpha, is also highly unconvincing:
-so, only a fraction of humanity will have access to changing themselves to be smarter and stronger.
Evolution was NEVER an equal possibility process.
This fraction of humanity will outcompete the rest - as in they/ their descendants will survive and the rest will dissappear, going the way of the dinosaurs -, as has happened many, many times in the history of life on Earth.
-even today, very few natural disasters can endanger a race of humanity as a whole - these are the type of disasters that endanger all of humanity (a gigantic asteroid, few others).
The regional disasters you mentioned don't even come close.
You seem to think that all competitors surviving and having a share of the future is a requirement of evolution. Very 'happy ending', but the opposite of correct, newtype_alpha.