Banking and gamification in a digital world

It seems to me that the banking sector is missing a trick in the digital space. One which would allow it to look more responsible for its younger customers whilst riding the wave of social media and gamification to engage them in spending and saving.
Using social apps like Foursquare, users can check in to locations and gain points - becoming the mayor of places they frequent and unlocking badges. This economy is universally understood.
The economy? Not so much.
So it makes sense to do what banks do best and capitalise on this wave of enthusiasm and understanding. Especially as banks already reward you with interest for saving money.
Help younger users understand the budgeting process by allowing them to manage their account through Facebook and mobile apps - most banks now have the former anyway.
Let us unlock badges for saving. Let us build up interest and accrue points. Let users model their future financial decisions and see possible outcomes before they make them - how much money will I have at the end of January if I save £100 a month but can’t afford to in July?
Make banking fun, educational and useful to people. It might just work.