  We study the impact of the black hole binary population currently probed by
LIGO-Virgo on future searches for the primordial gravitational wave background.
We estimate the foreground generated by the binaries using the observed event
rate and a simple modeling of the black hole population. We subtract
individually resolvable binaries from the foreground and utilize Fisher
analysis to derive sensitivity curves for power-law signals including these
astrophysical foregrounds. Even with optimistic assumptions, we find that the
reach of future experiments will be severely reduced.
