In the early days of electronic computers, machines like ENIAC were used for niche applications such as calculating ballistic trajectories and simulating nuclear explosions. These applications are very far removed from what computers are predominantly used for today.
It seems we have reached a similar development stage with regard to quantum computing. The applications researchers cite, cryptographic analysis and quantum systems simulation, are once again very far removed from everyday life.
Does anyone have a prediction on what quantum computers will be used for once they become affordable enough for regular people? Or will it forever remain just a research tool? Are quantum computers the key to cracking quantum chemistry and thereby molecular nanotechnology? (this is my guess as to what the actual impact of quantum computing will be)