A cat paradox ?

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I was thinking, in terms of schrodingers cat, if there is some sort of ultimate observer, would that mean that no alternate realities 'apart from ours' could exists since the quantum state in terms of their wave function...? since all other quantum states would be collapsed.... Or would this mean that the other realities would actually be stabilised due to an ultimate observer ?, as each reality, like a river breaking off from the mainstream and becoming a separate river, becomes its own continuum.?

 

These realities are however still part of the original realities just different in there continuum states...