Suppose that current and new forthcoming dark matter direct detection experiments find no evidence of Dark matter events and exclude interactions of hypothetical DM particles (like LSP or similar) in the cross-section range 10⁻⁴⁴-10⁻⁴⁸ cm². What would it mean for SUSY? What would it mean for "new physics" in the weak sector?
Short form: 1) Waffle with more and more of less and less as Yukawa potentials. 2) Do what everybody did to "explain" the Pioneer anomaly, the Fifth Force, absence of proton decay, and Gran Sasso's "superluminal" neutrinos: parameterize! There is nothing sacred about quantum gravitation or SUSY other than they employ vast numbers of people who cannot demonstrate empirical relevance.
Let's play empiricist not theorist, arXiv:1310.4009, 0906.0668. Milgrom acceleration not dark matter to satisfy the Tully-Fisher relation. Now we need free angular momentum. If we assume the vacuum is achiral isotropic toward hadrons (fermionic quarks), then parity violations, symmetry breakings, chiral anomalies, Chern-Simons repair of Einstein-Hilbert action. OK, the vacuum is trace chiral anisotropic toward matter (but not boson photons). Then, Noetherian coupling of exact vacuum isotropy to angular momentum conservation leaks for matter as MoND's 1.2×10^(-10) m/s*2 Milgrom acceleration.
This is no improvement unless we can measure said (crackpot scheme) vacuum trace chiral anisotropy toward matter. Einstein-Cartan-Kibble-Sciama gravitation contains chiral spacetime torsion. Spacetime curvature is a racemic subset (re Ashtekar). Opposite shoes embed within chiral vacuum (mount a left foot) with different energies. They vacuum free fall along non-identical minimum action trajectories, exhibiting Equivalence Principle violation. A pair of literal shoes won't do it, arXiv1207.2442.
Crystallography's opposite shoes are visually and chemically identical, single crystal test masses in enantiomorphic space groups, e.g., P3(1)21 vs. P3(2)21 alpha-quartz. OK, mount eight test masses in the Eötvös balance. 40 grams net as 8 single crystal test masses compare 6.68×10^22 pairs of opposite shoes (pairs of 9-atom enantiomorphic unit cells, the test mass array cube's opposite vertical sides).
Euclid did a perfect job. Cartography tells us Euclid is incomplete. Newton did a perfect job, but then relativity and quantum mechanics. Quantum gravitation and SUSY did perfect jobs, all of it irrelevant to empirical prediction. When things fail they were meant to fail. Look elsewhere consistent with prior observation.