I will start to be impressed when the industry has demonstrated a QC that can break even an arbitrary 8-bit private key (which a conventional PC can already trivially brute force).

Until then, I won't be convinced that the so-called 'qubits' they have developed so far even qualify as an actual base qubit necessary to be scaled to become a threat; and, as such, the question of how long it will take to scale an actual qubit - that doesn't yet appear to have been developed - to be a threat is premature.