True, but it's estimated that not long after mid-century we're going to experience a technological explosion with changes so vast and unthinkable it will make most pieces of science fiction ever written look like a joke:
They said the same kind of thing about 2000s in the 1970s (e.g. unlimited energy with nuclear/fusion power). There is no reason to assume it will actually happen. It might happen or we may find out that, like fusion power, the technical details make it a lot less revolutionary than people assume today.