I thought the Drake equation indicates the prevalence of life, while serenity is saying the opposite.
The Drake equation does exactly that Anax.
I personally believe we will find, at some point, that life is everywhere there is water. It makes sense. We've seen organic molecules in so many places at this point, that it would be hard NOT to find life.
I also think that eukaryotic (multi-cellular, nucleic) life is sparse, and that prokaryotes (mostly single cell, without membrane bound organelles) will be found in abundance. If you look at our own planet's biotope, most species are unicellular and microscopic prokaryotes.
It would only be logical to expect that trend to continue throughout the "neighborhood".