I think one big use of blockchain like tech will be in XVA [1], specifically CVA. The faster you settle, the lower the counterparty risk and funding requirements. There's good article (admittedly from a biased party) covering this in ibtimes [2]

[1] http://www.risk.net/risk-magazine/opinion/2422606/-smart-der... (not sure if this is paywalled or not)

[2] http://www.ibtimes.co.uk/setls-peter-randall-says-banks-bloc...