Quantum computers will be for ultra-hard problems where they are needed.
They could also be used where true random numbers are needed and if there are some killer quantum algorithms created to make all large database searches faster. They could become the accelerator for overall search and other ultra-large applications.
There are also optimization problems for routing planes and national and global systems. Fedex and other large organizations could have logistics made more efficient.
There could be advantages for machine learning and drug discovery.
We could all benefit indirectly from the advancement of science and more efficient logistics.