  The realization that supersymmetry (SUSY), if softly broken at the weak
scale, can stabilize the Higgs sector led many authors to explore the role it
may play in particle physics. It was widely anticipated that superpartners
would reveal themselves once the TeV scale was probed in high energy
collisions. Experiments at the LHC have not yet revealed any sign for direct
production of superpartners, or for any other physics beyond the Standard
Model. This has led to some authors to question whether weak scale SUSY has a
role to play in stabilizing the Higgs sector. We show that SUSY models with
just the minimal particle content may well be consistent with data and
simultaneously serve to stabilize the Higgs sector, if model parameters
generally regarded as independent turn out to be appropriately correlated. In
our view, it would be premature to ignore this possibility, given that we do
not understand the underlying mechanism of SUSY breaking. We advocate using the
electroweak scale quantity, $\delew$, to determine whether a given SUSY
spectrum might arise from a theory with low fine-tuning, even when the
parameters correlations mentioned above are present. We find that all such
models contain light higgsinos and that this leads to the possibility of new
strategies for searching for SUSY. We discuss phenomenological implications of
these models for SUSY searches at the LHC and its luminosity and energy
upgrades, as well as at future electron-positron colliders. We conclude that
natural SUSY, defined as no worse than a part in 30 fine-tuning, will not
escape detection at a $pp$ collider operating at 27~TeV and an integrated
luminosity of 15~ab$^{-1}$, or at an electron-positron collider with a
centre-of-mass energy of 600~GeV.
