Not sure if a service like this exists yet. But I imagine there'd be a market for it for people that want to convert a part of their monthly wage into coins without having to worry about going to an exchange, creating an order, etc...
Just set a wallet-address (ideally cold storage / paper wallet) and set your bank account to periodically wire some money and be done.
We offer this service. It's currently limited to UK bank accounts but we aim to go internationally soon (unless someone beats us to it!).