Just pointing out the equation, I don't really accept an equation like this unless we receive some evidence relating to such an equation (as you suggest).
I think is more ambitious than realistic but sometimes it is stuff like this that gives up the drive to search. The Kepler program is just another small realistic search step in the final search for real habitable planets or intelligent life. Drakes equation may have been set as a goal.
One thing I would like to see or even make is a narrow field Magnetic field detector. I think this would be a major step in finding habitable planets out of those candidates. The current instrument theory (muon Detectors or some other detector) is a while away unless I have missed something.
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