No, the forces are transferred to the fuselage in any case. If they weren't, the wing wouldn't be bending relative to the cabin, it would just experience rigid body motion instead.

Not quite true. As long as the frequency of the dynamic load isn't too slow relative to the natural period of the wing, then not all of that force has to be resisted by the wing connection. That's why wings are flexible, why we put shock absorbers in cars, and why flexible buildings can be designed for lower seismic loads.