Is it normal i believe it is humanity's purpose to create an ai to replace us?
I believe evolution produced us and that in turn the next step is for us to develop an AI/android replacement. A meta-evolution if you will. A better human created in our own image.
Humans are not capable of evolving past our tribal bickering nature and a lot of that has to do with the evolutionary process that created us. The need to survive and fight for resources against other creatures. Yet evolution produced us by chance with the reason and ability to take the next step that a natural evolutionary process could never take.
Producing a unified being that would overcome our shortcomings and expand to the stars. It would give the universe some meaning. Obviously these AIs would follow their own "evolutionary" process through their construction of new AIs.