In a former life i was a crash engineer in the auto industry, specialising in structures. It used to amaze me how many injuries can be attributed to airbags going off when the occupant is "out of position" - arm across steering wheel and that sort of thing. When you consider that the airbag is only really there because folks won't accept a full 4-point harness seatbelt as part of the seat, you wonder how sane the world is.
BRS should be seen in the same light. It no way guarantees every accident is survivable, but it does present more options. Hurling air at the gound to defy gravity is by it's very nature risky, so options are good. Maybe there needs to be an option of autodeploy, so that a BRS untrained pilot has a reliable backup. Maybe there needs to be an option of flaring, so the BRS works over more varied terrain. Certainly a parachute riser ring so the aircraft can be recovered from speed is a must.
Mart