When we talk about QC, we do need to distinguish between two types of research:
(1) the hardware engineering component of building a physical quantum computing device, and
(2) the algorithmic (aka algorithms that incorporate features of quantum theory to solve specific problems, and the theoretical properties of said algorithms).
Even assuming that (1) above becomes a practical reality within my lifetime doesn't guarantee a host of new jobs for physicists. Sure, some physicists could see themselves developing hardware for new quantum computers, but not many.
For (2), I see whatever new jobs related to that aspect to be primarily led by computer scientists, particular theoretical computer scientists specializing in QC algorithms.
On the more general question of a brighter future for physicists on the job front -- the future is reasonably bright for those who leave physics research.
For example, those with physics backgrounds should be able to find employment in areas like software development, finance, geology, medical physics, nuclear reactor work, data science, public policy, patent law, teaching (elementary & secondary school), etc. (perhaps also in areas like photonics or solid state in some engineering companies).
But I don't see much reason for optimism for increased job opportunities in physics research any time soon, either in academia or in industry.