Regarding adoption, I think it's worth pointing out that these sorts of conventions can and do shift within a generation. I recall quite clearly while growing up the convention for indicating years < and >= the year one [1] was B.C. and A.D. It seems like over the past few years we've definitively decided on B.C.E. and C.E. instead [2].
All it really takes to catch on is adoption by a handful of elementary school textbooks -- and those publishers have adopter much crazier things in the past. As the manifesto points out, this is distinctly pedagogically useful, so it doesn't seem beyond the realm of possibility.
--
[1] Correction: Julian/Gregorian years begin with 1 A.D. (I still prefer the AD/BC convention, as the two identifiers have an equal number of characters.)
[2] I'll admit that my perception of prevalence here may be strongly influenced by the fact that Wikipedia has adopted this convention.
All it really takes to catch on is adoption by a handful of elementary school textbooks -- and those publishers have adopter much crazier things in the past. As the manifesto points out, this is distinctly pedagogically useful, so it doesn't seem beyond the realm of possibility.
--
[1] Correction: Julian/Gregorian years begin with 1 A.D. (I still prefer the AD/BC convention, as the two identifiers have an equal number of characters.)
[2] I'll admit that my perception of prevalence here may be strongly influenced by the fact that Wikipedia has adopted this convention.