"It should serve as a wake-up call for SETI theorists facing into the silence that has so far greeted us from the stars. We need new thinking to understand this silence in the context of astrobiology findings that promise a universe abundant with life."

Full article here:

http://www.centauri-dreams.org/?p=696

While I agree that perhaps the author of the paper should have
labeled certain things more clearly as speculative, anyone familiar
with the subject will know that most items in this field are speculative,
plus we have improved in our views of where and how ETI might be,
so going on that new paradigm should not be an issue.