That computers will be able to think is a plus for humans. Humans do not have to do all the hard work any longer. They get to relax more and have lots of leisure. On the other hand, when humans sit down to interact with computers, now that they are smart, the human brain is more likely to grasp the level the computer is thinking and how it is doing so that they continuously focus on the issue. Therefore, in the long run, humans will start to think like computers which poses a problem to society.
These people will be weirdos, no longer being able to enjoy family life and recreation. Their minds will continue to concentrate on how computers are able to think and get glued to the aspect so that they go into another world, which no force might be able to bring them back to the real world.