Predicting the future is hard, specially if you think in 20-30 years forward. But, giving enough predictions, you will have a lot of hits in a sea of misses. A lot of development happened in the middle that could had turned things in different directions. Also, beware of hindsight bias.

Anyway, it is not just one data point what matters. What comes after in his predictions and how adjusted is to what happens in reality (without creative accounting, like with Nostradamus predictions) may tell how right that was.