Comment by tomgag

Oh, I didn't mean to imply that the "cliff" is for certain. What I'm saying is that articles like Gutmann's fail to acknowledge this possibility.

Regarding the coaxial cables, you seem to be an expert, so tell me if I'm wrong, but it seems to me a limitation of current designs (and in particular of superconducting qubits), I don't think there is any fundamental reason why this could not be replaced by a different tech in the future. Plus, the scaling must not need to be infinite, right? Even with current "coaxial cable tech", it "only" needs to scale up to the point of reaching one logical qubit.