On 12/15/18 12:59 PM, Jonathan Thornburg [remove -animal to reply] wrote:
The actual event rates for BH/BH, NS/NS, and BH/NS coalescences are
rather uncertain. To date 7, 1, and 0 of these (respectively) have been
observed (https://arxiv.org/abs/1811.12907), and with continued GW-detector
tweaks and improvements) it seems likely that the detection rates will
increase by a factor of 3-10 over the next decade.

Looking beyond the decade
And again referencing the Physics Today Dec 2018 article:
The ESA Interferometer Space Antenna(LISA) to be launched in 2034
will operate in the milliHz range
(10-10,000 Hz range of ground based gw detectors)
involving coalescence of black holes of 10^4 - 10^7 solar masses
for distances corresponding to redshifts as large as 20
with accuracy to determine the source position
accurately enough to pin down the galaxy cluster
or even the galaxy hosting the event.
Corresponding narrower Ho resolution is expected.

Are there any anticipated Planck spacecraft replacements
to verify its CMB based:
Ho2 = 67.74 ±.46 km s^-1 Mpc^-1?
The Webb infrared spacecraft will not apparently do it.
Richard D Saam

[Moderator's note: The James Webb Space Telescope is more like a
traditional telescope in space, the successor to HST in some sense, but
with more emphasis on the infrared. The CMB is observed at lower
frequencies, with bolometers (which are also used in the far
(lower-frequency) infrared) and traditional radio receivers. As far as
I know there is no CMB satellite in the works, but some ground-based
stuff such as the Simons Observatory. -P.H.]