  Assuming the validity of the equivalence principle in the quantum regime, we
argue that one of the assumptions of the usual definition of quantum mechanics,
namely separation between the ``classical'' detector and the ``quantum''
system, must be relaxed. We argue, therefore, that if both the equivalence
principle and quantum mechanics continue to survive experimental tests, that
this favors ``epistemic'' interpretations of quantum mechanics (where formalism
is built around relations between observables) over ``ontic ones'' (assuming
the reality of states and wavefunctions). In particular, we show that
relational type interpretations can readily accomodate the equivalence
principle via a minor modification of the assumptions used to justify the
formalism.
  We qualitatively speculate what a full generally covariant quantum dynamics
could look like, and comment on experimental investigations.
