Less than 0,1% (and I am being VERY optimistic here).
According to this
https://en.wikipedia.org/wiki/Demography_of_the_United_States
there are around 120.000.000 adult men out of which I guess the 20.000.000 don't even bother to shave with this beard craziness around us.....
So we are talking about 100.000 people (again this is a very optimistic number) ,I don't think that these will reverse the shaving trend any day soon....
Not anytime soon.