  We use the Sloan-Digital Sky Survey quasar catalog to statistically infer the
local abundance of black holes heavier than $10^8M_\odot$, which allows us to
estimate the detection prospect of super-massive black holes by future
observational campaigns. We find that the upcoming James Webb Space Telescope
(JWST) and the Extremely Large Telescope (ELT) should be able to resolve, with
integral field spectroscopy techniques, the gravitational influence of
$\sim10^3$ black holes within a sphere of $\sim50\;\rm Mpc$. A Very-Long
Baseline (VLB) observatory with one receiver placed in a geostationary orbit,
is predicted to capture $\sim10$ images of the silhouette of a black hole,
similar to the image of $\rm M87^*$ recently performed by the Event Horizon
Telescope.
