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I didn't understand what you meant first either, but now I think you more or less ask wether the future understanding of marrying QM and GR must necessarily be cast in the form of a "regular quantum theory" of gravity, in the sense that the state of the gravitational field somehow fits into some fixed hilbert space etc.But considering the holy grail of combining qm and gravity has been so elusive, and also considering the abstact nature of quantum state description, then it seems logical ( at least to me) to question whether gravity has a similar asbtract existence within the qauntum state's environment.

IMHO, we don't know that. It could equally be that instead of inventing a regular "quantum theory" of GR in some sense, QM may need to be revised. I think there is indications that using a regular quantum theory anzats of hilbert spaces of equivalenec classes of observes etc, is quite questionable.

/Fredirk