I can't agree that QM explains everything. For example QM doesn't explain galaxy formation. That is easily explained by GR. Also QM doesn't explain the formation of black holes. But it was QM that brought about the theoretical (but widely accepted) evaporation of black holes. QM also is used to determine what happened right after the big bang. GR is used to explain the expansion of the universe from that time to the present. QM just doesn't work on the scales involved.
Another example: The Sun. QM explains the mechanism by which hydrogen is converted to helium (and other elements), but GR is required to provide the pressures required for the process.
So QM and GR are complementary, but there definitely is a problem when they start getting into the same size range. We are definitely agreed on that. I don't think that that we will merge QM and GR. There will be some other theory that will contain both of them. And that seems to be where there is some minor disagreement between us.
Bill Gill
