I disagree it would be 'more' interesting, this game is Romacentric and about the rise of Rome into Empirehood after all.
But it would make for a fun mod. Main reason i think is that a lot of work is needed and most modders are dividing their attention. Several map redoes out there, small edits etc. Imperium is the biggest attempt at a mass mod and it's upcoming new version will actually go back in time not forth to the decline or division.
So... work + need for a dedicated group of modders.