It's not qbits themselves that have to shrink, but the support machinery, that measures/cools/traps/shields them. Basically the qbit / area or qbit / volume metrics are the important. Also, dollar / qbit is the relevant factor at the end of the day. (And watt / qbit for operating the whole machine.)
Agreed qubit per area or volume is important, but those are not capable of undergoing a Moore's Law event. Entangled qubits cannot now be packed orders of magnitude closer since they're already at the quantum limits.
Moore's Law did not shrink support machinery much at all. It shrunk the lowermost information processing piece. That lowermost piece in this case cannot be shrunk in the same manner.
The fact the bottom cannot shrink is causing Moore's law to end as it is. There is no way around these quantum limits without a major change in physics, one that is unlikely to ever happen.
None of the pieces you list can scale the same way area did for Moore's Law to work for transistors.
Moore made his prediction in 1965. Transistor area in 1971 was a 10,000 nm process. Modern process is a ~10 nm process. This 1000 fold reduction in linear size (which is a 1 million reduction in area, 1 billion in volume) cannot within any reason happen to your items.
Money and power and count dropped in Moore's law only and precisely because feature size dropped, and this could only happen because the initial features were macro scale, not quantum scale. This cannot happen to qubits - they're already at the end of the quantum line.
We will likely someday get smaller quantum computers. They won't follow a Moore's Law from where they are now, however, for the same reasons nothing other than transistor based items followed a Moore's Law - the physics precludes it.
