Ok, it seems clear that it would be improbable for dark matter, by itself to form black holes. But it still leaves the problem of dark matter and existing black holes.
The planets don't fall into the sun because they conserved the momentum of the particles or gas and/or rubble (as a system)...
Hello,
Firstly, i would like to say that i am by no means an educated person (as in taking specialty courses or an university degree in cosmology or physics), at least regarding this subject. From this point of view, what i am about to ask might seem silly or just plain stupid, so feel free...