In American English, one would not bat an eyelash at the above use of "one".
EXACTLY
And where did you get that "95%" stat Citizen? I am curious. I don't hear/see it everyday, but it is not that uncommon..even here in Podunk NC where I am staying this year.
I personally don't use it as often since I have lived in SW most of my life and therefore use "Y'all"
Did you live in a northern state?maybe they don't use it up Northeast? I never lived very long North of VA/KY. Cali uses "you guys" more often as does WA. But you can still hear or see it.
And after all...... "One Does Not Simply Walk into Mordor" ~ Boromir