SBD can be very useful if ever someone develops a mobile payment network - if shops accept payment in crypto for goods and services, the steem blockchain has 0 transaction fees and 3 seconds blocks and a sleek mobile wallet (steemwallet by @roelandp). A shop then can price its goods or services in SBD which is far less volatile than STEEM - the financial "currency risk" is it taking is much lower than with STEEM.