  Any consideration of future physics facilities must be made in the context of
the Tevatron and the LHC. I discuss some examples of physics results which
could emerge from these machines and the resulting questions which would remain
for a high energy $e^+e^-$ collider. Particular attention is paid to the
electroweak symmetry breaking sector. If a light Higgs boson exists, it will be
observed at the LHC and the role of any later accelerator will be to map out
the Higg's boson mass and couplings and then determine the space of possible
models. If there is no light Higgs boson, then some effects of a strongly
interacting electroweak symmetry breaking sector will be observed at the LHC
and I discuss the role of a high energy linear collider in exploring this
scenario.
