Starstreaks' plume isn't that big, see here...
The missile fires its first rocket motor, which launches the missile but burns out before leaving the tube to protect the operator. Only once the missile is a safe distance from the operator the second motor fires, which rapidly accelerates the missile to burn out velocity of M3.5 some 400m away from the soldier. There is no warhead to speak of (~500grams), it is a "hit-tile". All in all, it is probably ideally suited to urban ops as it has little plume on the ground, no warhead and the small darts are the only thing that will do any real damage - they probably wouldn't drop a building but they would give you a "haircut" if they landed on you!!!
LJ
PS. i forgot to mention that the darts self destruct as they reach max range. So unless there is a guidance fail, there is little chance of serious collateral.