I disagree.
Sure, if 3.7% of our galaxy's stars are Sun-like, that still means there are 9 billion like it in the Milky Way. Rare? Maybe. Unusual? Not so much.
Andy
Well you're just extrapolating Y times 2.7% (not 3.7%) = 9 billion in isolation and ignore a lot of what he goes on to say. He says the Sun, a G class dwarf and that type is representative of 2.7% of the total.
He continues 50% our star's type are in a binary star system whereas, obviously, our star is a single system. So that 2.7% relevant to our star type is now halved.
Further, if the remaining half of the Sun like stars are 'noisier' this cuts the number of G Class dwarves that are the same as the Sun. Sorry, Im not certain what fraction he says this it but based on the intended extension of the Kepler mission by a further 4 years, Id guess this to be in the region of another 50% or thereabouts.
Nowfactor in the different ages of G Class stars compared to our Sun and the number drops again by a factor of at least 50% if not more like 70% or so.
All this is before you start discounting G Class dwarves that have no terrestial planets in the goldilocks zone etc, etc.