I think that view was based on the (probably correct) idea that sufficiently reliable physical qubits could not be built. The more qubits in the computer, the m

I think that view was based on the (probably correct) idea that sufficiently reliable physical qubits could not be built. The more qubits in the computer, the more reliable the qubits would need to be. Since the discovery of quantum ECC, that's no longer a reason to believe a quantum computer can't be built, a reliable logical qubit can be built out of a number of less reliable physical qubits.