That does not mean the evolution of intelligence has ended on the Earth. We can expect that a new species will arise out of man, surpassing his achievements as he has surpassed those of his predecessor Homo erectus. The new kind of intelligent life is more likely to be made of silicon. Jastrow thinks this evolutionary leap to sentient computers may still be a million years off. In the meantime, one can foresee problems along the way.
Artificial intelligence is, after all, a technology.
Like all technologies, it is somebody's property. That is a significant difference between computers and human brains. They are more and more owned and programmed by governments, corporations, and the military, interlocking super-institutions that use computers in their own interests. As speculative as they may seem, such evolutionary vistas are not politically inconsequential. There is another danger to which the computer model of mind opens us.