For most problems, quantum computing is not faster. But when it is (theoretically) faster, it is much faster. Perhaps we may see quantum coprocessors one day.

We have seen already with the slow adoption of multi-processors and 64-bit computers that being able to run current software is required for any successful PC architecture. Even the devices currently replacing PCs for specific tasks still run OSs and software that's much closer to what we ran on our Apple II's decades ago than whatever that would orchestrate a purely quantum personal computer.

Devices like the one IBM demonstrated will probably start as peripherals to more familiar computer architectures, much like our PCs have GPUs that vastly outperform the processors that control them, yet, are no more than assistants in the general operation of the computer.