Yes. Although that's something of a two-edged sword: in addition to real disincentives to release an AI that was not supposed to be, positive incentives would also be real.

Also it should be noted that I continue to be supportive of the idea of boxing/capacity controls of some kinds for autonomous AGI (they would work better with only modestly superintelligent systems, but seem cheap and potentially helpful for an even wider range), as does most everyone I have talked to about it at SI and FHI. The boxing game is fun, and provides a bit of evidence, but it doesn't indicate that "boxing," especially understood broadly, is useless.