  Discussions are underway for a high-energy proton-proton collider. Two
preliminary ideas are the $\sqrt{s}=33$ TeV HE-LHC and the $\sqrt{s}=100$ TeV
VLHC. With Bayesian statistics, we calculate the probabilities that the LHC,
HE-LHC and VLHC discover SUSY in the future, assuming that nature is described
by the CMSSM and given the experimental data from the LHC, LUX and Planck. We
find that the LHC with $300$/fb at $\sqrt{s}=14$ TeV has a $15$-$75%$
probability of discovering SUSY. Should that run fail to discover SUSY, the
probability of discovering SUSY with $3000$/fb is merely $1$-$10%$. Were SUSY
to remain undetected at the LHC, the HE-LHC would have a $35$-$85%$ probability
of discovering SUSY with $3000$/fb. The VLHC, on the other hand, ought to be
definitive; the probability of it discovering SUSY, assuming that the CMSSM is
the correct model, is $100%$.
