Safecoin is not and will never be The Currency. Its purpose is to serve the network. Any other purpose is ancillary.
The world will almost certainly be shifting to multiple voluntary currencies, all of which can be swapped on the fly by exchange mechanisms.
Safecoin is not divisible from the start because it would put an undue computational burden on the network to account for units of such small value. It is not like bitcoin which is a ledger system. Each unit is a cryptographic identity.
The SAFE Network will allow for many other easily managed currencies, just waiting to be bestowed with value. Also there are other platforms, on top of Bitcoin and separate from both, which will compete for usage, as it should be. There will be no ONE CURRENCY TO RULE THEM ALL, as the US dollar has been. So a super-high level of divisibility is not needed till it’s needed.