Who is disputing that? I am 99.9% certain that this is true.
The point of the singularity isn't that AI is coming next summer -- it's that from one developmental point and on the intelligence and abilities explode exponentially. To get to that stage though, thousands of years might pass.
> It is also reasonable to think that such change would probably be in symbiosis with human intelligence.
Now that is not likely. At all. They have to have the same motivation, interests, emotions and needs like us. The chances of an artificial race being developed to cover all these at once are practically zero.
A race not motivated by the same things we are is practically impossible to sympathise with our own motives.