  Interlayer excitons confined in bilayer heterostructures of transition metal
dichalcogenides (TMDs) offer a promising route to implement two-dimensional
dipolar superfluids. Here, we study the experimental conditions necessary for
the realisation of such collective state. Particularly, we show that the moire
potential inherent to TMD bilayers yields an exponential increase of the
excitons effective mass. To allow for exciton superfluidity at sizeable
temperatures it is then necessary to intercalate a high-$\kappa$ dielectric
between the monolayers confining electrons and holes. Thus the moire lattice
depth is sufficiently weak for a superfluid phase to theoretically emerge below
a critical temperature of around 10 K. Importantly, for realistic experimental
parameters interlayer excitons quasi-condense in a state with finite momentum,
so that the superfluid is optically inactive and flows spontaneously.
