True enough that a mistake was made, but the fact remains that the calendar is centered on the birth and life of Jesus Christ. "BCE" is a contrivance that uses the same exact calendar, but removes Christ's name from the calendar that Little Dennis created about Him.
"Before Common Era" means absolutely nothing. What does 2006 have in "common" with A.D. 6? And how is A.D. 6 so uncommon to 6 B.C.?
If you want to divide history into "Eras", you might as well extrapolate the whole Stone Age/Bronze Age/ etc. But even the Ivory Tower Elites realize that they can't get through a new calendar with a new numbering system any more than they could replace time with a metric minute.
How long until they want us all to use A.H. (After the Hejira)?
2006 A.D. is the year 1427 A.H.