  We evaluate the discovery probability of a combined analysis of proposed
neutrinoless double-beta decay experiments in a scenario with normal ordered
neutrino masses. The discovery probability strongly depends on the value of the
lightest neutrino mass, ranging from zero in case of vanishing masses and up to
80-90\% for values just below the current constraints. We study the discovery
probability in different scenarios, focusing on the exciting prospect in which
cosmological surveys will measure the sum of neutrino masses. Uncertainties in
nuclear matrix element calculations partially compensate each other when data
from different isotopes are available. Although a discovery is not granted, the
theoretical motivations for these searches and the presence of scenarios with
high discovery probability strongly motivates the proposed international,
multi-isotope experimental program.
