I would argue that with further knowledge (e.g if we figure out Quantum Gravity), these interpretations will no longer apply at all, as they are equivalent desc

I would argue that with further knowledge (e.g if we figure out Quantum Gravity), these interpretations will no longer apply at all, as they are equivalent descriptions of an incorrect (or, "effective"/approximate) theory. It's not that we lack the tools to distinguish between Copenhagen and MW, but that they are designed to be not possible to distinguish. Further science will produce theories who have different interpretations (hopefully, just one :)