religion and calendars
I wonder what it would take for another calendar numbering shift to occur. Like, some bozos introduced "BC" and "AD" and numbered the years around that.
I guess it was mostly for a more accurate calendar, but the BC/AD thing was We Sure Apotheosise This One Guy.
There probably won't be a new calendar system unless we realise the current one has been off this whole time or blow something up and throw off the orbit.
Which in turn means there may be no excuse for new year numbering. Especially when we've built computers around this one.