This is a pretty good analogy for the state of quantum computers right now! One difference is that (in principle) it is possible to do quantum error correction

This is a pretty good analogy for the state of quantum computers right now! One difference is that (in principle) it is possible to do quantum error correction. Essentially this turns a number of imperfect "physical" qubits into a perfect "logical" qubit. However, this requires extremely low error rates of the physical qubits to begin with and creates a lot of overhead. All existing quantum computers are much too small and noisy to implement quantum error correction except for some proof-of-principle experiments. I am somewhat pessimistic that any of the current technologies can be improved enough to make it possible in practice.