Bitcoin Wallet (powered by bitshares) Transmute your coins and earn interest in Bitcoin, Gold, Oil, or USDollars.
Keeping bitcoin as the focus would be important to gain bitcoin purists interest without creating opposition or defensiveness.
Primarily as a bitcoin wallet, you wouldn't even need to mention BTS/bitUSD/bitBTC but that is how it works in the background. They would still be able to send receive bitUSD etc but it wouldn't be billed as a bitshares wallet. (perhaps an advanced feature where you could change the wallets 'Focus' from default-bitcoin to BTS or bitUSD etc)
In addition, once we have some automated BTC<>bitBTC transmutation, users of this wallet could then gain all the benefits of named accounts, faster confirmation times, lower transaction fees, etc. between BTC users of this wallet and not even realize they're using the bitshares network.
There's no reason to try and replace bitcoin and we have more to gain by embracing and including bitcoin.
.... "bitshares makes it better"