  We complete an old argument that causal diamonds in the crunching region of
the Lorentzian continuation of a Coleman-Deluccia instanton for transitions out
of de Sitter space have finite area, and provide quantum models consistent with
the principle of detailed balance, which can mimic the instanton transition
probabilities for the cases where this diamond is larger or smaller than the
causal patch of de Sitter space. We review arguments that potentials which do
not have a positive energy theorem when the lowest de Sitter minimum is shifted
to zero, may not correspond to real models of quantum gravity.
