Does it mean we could, on an airliner, at low altitude, firewall the thrust levers, without major inconvenience or loss of control, just ignoring the overspeed warnings ?
What kind of speed would be reachable ?
Where Mmo, or the mach operating limit applies at altitude, of course Vmo applies at lower levels. Flutter may be a consideration, but with non-reversible controls, not so likely.
In order to reach a region where the mach effects of compressibility become a factor at low altitudes you'd have to increase your airspeed beyond Vmo...hence the reason at low altitudes we're IAS limited, and at higher altitudes, mach limited. You can push up the power if you like, but you do have aircraft limitations to consider before you go too far.