The milli- micro- prefixes are nice and proper and all, but they wont work for the layman, which a unit of currency needs to be.  I can completely understand the prefixes, and even I fear a world where I'd have to say "microbitcoins" regularly.

The only other feasible option I've seen outside of "bit" was "moto".  

It has a good, concise ring to it and comes from -Nakamoto-

your premise assumes that dogecoin and goldcoin are correct and represent standards that should be followed.

They're just alt digital currencies.  One being a huge joke.  I don't see why bitcoin must follow their lead.