The idea itself is not a bad one, it just comes with a few flawed premises.
A.) If the gun owner is a serious gun owner who carries on a daily basis, he will likely have control of his loaded weapon at all times, eliminating the need for this safety device.
B.) If the gun owner is a serious gun owner who does not carry, he will probably have his weapon(s) either secured in a safe, manually disabled (bolt removed), or protected by another system (lock, small safe, etc.)
C.) If the gun owner is a poser, needing a gun to get his dick hard, he will not ever hear of this product, as he doesn't care about anything beyond 'I have a gun'. He very possibly doesn't even have a cleaning kit for it.
D.) If the gun owner is a criminal, he will likely ignore the safety aspects of firearms handling entirely. This is one of the classes from which most accidental discharges come, IMO.
E.) If the gun owner is your average, 'knows enough to get himself in trouble' Joe, this might be a good thing, as, if he does not have his weapon(s) locked up, they will likely be accessable by people other than himself. This, unfortunately, includes nosey kids. This is where the other large percentage of accidental discharges comes from. Again unfortunately, these are the people, who, faced with a threat, will probably attempt to fire their weapon, forgetting about the 'Safety Bullet', and rendering themselves immediately defenseless.
This is, of course, just my opinion. :happy: