The DS, iPhone or what ever the device maybe is a good, not a service. As a good you can do what ever you want to it, including detonating it, selling it, hoarding it, eating it and of course using it.
By allowing the company to remotely brick your phone over piracy isn't something that should be allowed. We all know how accurate the RIAA is at targeting piracy (Not at all), but this would remove even that small amount of legal protection from a company from screwing you over.
What would stop them from bricking your device claiming "misuse" with your evidenced locked in a bricked device which is also the very device they can claim as evidence to your piracy? It's circular. It erodes legal safeguards. The company would become Judge, Jury and Executioner to your device.
It is potentially useful if only the owner could activate such a feature, but it would be far too open to an outside attack for the average person. If this was for some high security thingamabob, that required deactivation over some sort of Tom Clancy situation, yeah, maybe. Like the Presidential nuclear football, but that would defeat it's purpose, which is to give the President access to the arsenal at all times.
As far as existing remote bricking services, if I remember correctly, with cell phones it is possible for the owner to request a stolen phone be denied from the network, but not bricked.