Active vibration cancellation is already in use in semiconductor fabs and other sensitive manufacturing applications. But it has technical limitations: just like active noise cancellation, it works better for lower frequencies, lower amplitudes, and smoother waveforms. So it's sort of the final layer of protection: first you choose a quiet site, then you construct the building and the equipment footings using passive solutions that dissipate as much vibration as possible and smooth out the jerks, and then you use active solutions on the equipment itself.