CE/BCE is already a standard in many disciplines. Make it so in WP.
...except where use of BC and AD is appropriate. Would you have us
convert every instance of something being measured in feet, inches,
fathoms, chains, pounds, ounces, psi and the like to its metric equivalent?
You can't impose a blanket policy where the usage is dependent on
context. Like naming conventions, there *are* exceptions to the rule.
It would be wonderful if Wikipedia converted completely to the metric
system, or perhaps [[SI]] ("the most widely used system of units").
Perhaps units should be referred to the Countering Systemic Bias
Wikiproject.