I think that it will be a necessary feature for the more important markets. Nodes acting as market makers by placing a bunch of orders around equilibrium, are going to be targeted regularly by attackers. A home PC with a consumer level ISP connection is not hard to knock off the network indefinitely. An attacker could be watching the orders, DDOS all critical nodes, blow through all the orders (up and down) and then have the market effectively to themselves. Having a couple of nodes act in concert (whether controlled by multiple people, or just one person) they could break BitUSD upwards or downwards to wherever they want to put it.
It may be an "edge case" or a "0.01% situation" but the fact is, people can and will intentionally push the markets to the edge, and do what they can to neuter the 99.99% acting to keep the market stable. This is an open, anonymous network; there is no way to permanently prevent bad actors from accessing the network over and over and over again.