Maybe but that would have to be worked into the vehicle, either when they release the next generation IS or at the mid-life facelift.
They have a safety pack for the IS currently which doesn't require extra work, they should just bring it to the lower grades - which they have done with the NX, it is standard across the whole range. Even offering it as an option would be something, I'm sure they make money on the price they charge so why not offer it up to more people?