With Jaxx-wallet the idea is partially there so far, however it has limited coins, does not connect to hardware wallet, and the exchange is made using Shapeshift.  Wallets like these could fall within the Blocknets scope, although maybe blocknet may end up being a specialized exchange service (i.e. one of the wallets 'apps').  More ambitiously, the end product I see would be something like the Ethereum Mist Browser, except the Browser is blockchain specific, whereas this general purpose software would be multi-blockchain.  I haven't found any project like this out there (except Jaxx and hardware specific lite clients like Trezor, but  how do you invest in them?); blocknet comes nearest to the above vision from the projects I know.