Yes. You could, for example, allow a measured particle to interact with an isolated measuring apparatus of varying size - from a few atoms to a macroscopic obje

Yes. You could, for example, allow a measured particle to interact with an isolated measuring apparatus of varying size - from a few atoms to a macroscopic object - and see how the size affects the system - so you get evidence of decoherence? Also, many worlds interpretation as it currently exists is already falsified by its incompatibility with gravitational nonlinearity.