Not exactly wrong prediction though. It took so many years to get people carry laptops to fishing. What is important is that the author couldn't predict the advancement in Internet and Cloud computing which brought a whole new set of capabilites for laptop.

So the interesting problem/challenge is– there will always be advancements and shocks and changes that we can't predict, that will completely invalidate the assumptions that we build our predictions on.

It might be helpful for prediction-makers to list all the assumptions we make when we're making predictions. I suppose the problem is that we always make more assumptions than we even realize.