While the field of dark matter direct detection remains focused on the standard GeV-TeV mass WIMP hypothesis, there is motivation to broaden the search to include lower-mass hypotheses, in the keV-MeV scale.  Sensitivity in this range is limited not by target mass (gram-scale experiments are quite interesting), but is driven entirely by detector threshold (a goal threshold would be measured in milli-eV).  I will lay out an argument that the phonon and roton excitations of superfluid 4He form a promising path towards sensitivity in this low-energy regime, and I will lay out the experimental questions and challenges to this approach.