Wait for Evolution release and then Exodus implement it and you will get all of this. A multi currecy third-party wallet would give all the benefits carried by your idea and wouldn't incur in costs and efforts for the Dash team/network. Nice for a 3rd party wallet but won't support it in Evo's official wallet.
This makes sense. Unless I'm mistaken, Evolution is a platform (not necessarily an end-user wallet) that allows easy integration of unique dash features through the new DAPI. The whole point is to encourage widespread adoption of the currency itself by using it in all kinds of different ways, not to restrict everyone to a semi-centrally managed, one-size-fits-all software program.