  We analyse the sensitivity of quark flavour-changing observables to the MSSM,
in a regime of heavy superpartner masses. We analyse four distinct and
motivated frameworks characterising the structure of the soft-breaking terms by
means of approximate flavour symmetries. We show that a set of six low-energy
observables with realistic chances of improvement in the near future, namely
$\Delta M_{s,d}$, $\epsilon_K$, $\epsilon_K'/\epsilon_K$, $\mathcal{B} (K\to
\pi\nu\bar\nu)$, and the phase of $D$--$\bar D$ mixing, could play a very
important role in charactering these frameworks in a regime of superpartner
masses up to $\mathcal{O}(100)$~TeV. We show that these observables remain very
interesting even in a long-term perspective, i.e.~even taking into account the
direct mass reach of the most ambitious future high-energy colliders.
