My thoughts exactly, I always think: perhaps in 10 years we find an alternative to radio based communication which is far superior and then we find the galaxy teaming with communicating life forms... Or not. Who's to say? This whole thing seems to me an exercise in quantifying unknowns. We don't know the size of the categories we don't even know we don't know anything about. This can still be a fun exercise of course and it can give you an idea of the assumptions to prove or disprove but still... the value (beside the entertainment value) is pretty small imho.
Yep. Or maybe we’re all wrong about quantum mechanics or any of a number of theories. There’s a huge portion of the universes mass that we can’t explain. The unknowns are far too large to extrapolate.