If the world evolved in linear terms, you would be right. However, the rate of scientific advancement has multiplied exponentially over the history of mankind:

If the world evolved in linear terms, you would be right. However, the rate of scientific advancement has multiplied exponentially over the history of mankind: our scientific understanding has advanced more in the last 100 years than it has in the previous 10000 combined (nuclear physics, quantum physics, molecular biology, information technology, astronomy/cosmology - you name it.) Remember, 10 years ago smartphones were in the realm of science fiction. Now, everyone has one in their pockets. Today we can train a computer for a week to generate a cute little christmas jingle. How many years do we need to train a human child to do the same? AGI won't happen overnight, sure, but its effects of that research will be felt continuously along the way.