One doesn't, and he won't.If one agrees with the translational philosophy of the 2011 NIV, they should embrace it.
There are one or two places where it is acceptable to mix singulars and plurals. Everyone and everybody are singular pronouns, but they always refer to more than one person. Therefore it is quite permissible for me to say, "Everyone who would like a Gideon Bible should come to the front and I will give them one." But one means 'one.' so to write " If one agrees with the translational philosophy of the 2011 NIV, they should embrace it" is ugly and horrible English and I don't care if Thackary or whoever it was wrote something similar once, I would not read such a sentence out loud.