Thing is: years from now, when quantum computing becomes a standard in industry / science, it won't be very widespread - even among programmers.
I mean: to write efficient algorithms today (or low-level stuff: OSes, drivers and such), you need to know a few things about how a CPU and memory work. No way around it. But the basics are pretty easy.
To write efficient algorithms on quantum computers (more importantly: to understand what problems they're actually good at), you'll most likely need some understanding of quantum physics. So we're talking about a fairly small part of the population.