The problem is assuming the upper bound is close or at human level for intelligence. There's no reason to think that and clearly outlier humans like John von Ne

The problem is assuming the upper bound is close or at human level for intelligence. There's no reason to think that and clearly outlier humans like John von Neumann that are still in the Human range are far more capable than the average person. If you only could make machines as intelligent as that it would still be revolutionary.