  In this paper we quantify the trade-off between setups optimized to be
ancillary to Phase II Superbeams or Neutrino Factories and experiments tuned
for maximal sensitivity to the subdominant terms of the neutrino transition
probability at the atmospheric scale (``maximum discovery potential''). In
particular, the theta(13) sensitivity is computed for both Phase I superbeams
(JHF-SK and NuMI Off-Axis) and next generation long baseline experiments
(ICARUS, OPERA and MINOS). It is shown that Phase I experiments cannot reach a
sensitivity able to ground (or discourage in a definitive manner) the building
of Phase II projects and that, in case of null result and without a dedicated
$\bar{\nu}$ run, this capability is almost saturated by high energy beams like
CNGS, especially for high values of the ratio $\Delta m^2_{21}/|\Delta
m^2_{31}|$.
