Gravitational Waves Discovered for the First Time!

So merging black holes produce massive and rapid oscillations in the fabric of space time which makes it possible for us to detect them.  Presumably then every interacting mass will produce some sort of ripple, but these will be so weak and low frequency that detection will be much more difficult.  So well done for picking them up at all, but IMO it's not a eureka moment if all we can detect are the very occasional merging black holes.  Presumably more sensitive detectors would not be earth based at all and have much longer baselines? 
Oh and for the end of the world conspiracy theorists, since we have just detected that super-massive black hole it means its gravity has just reached us and it is now pulling us in its direction and it will quite likely disturb the orbits of all the planets and asteroids... So the end is nigh :-)