Some related thoughts.   I think the main issue here is actually making the claim of permanent shutdown & deletion credible.  I can think of some ways to get around a few obvious issues, but others (including moral issues) remain, and in any case the current AGI labs don't seem like the kinds of organizations which can make that kind of commitment in a way that's both sufficiently credible and legible that the remaining probability mass on "this is actually just a test" wouldn't tip the scales.