This would imply I'd have thought out every scenario in my head before making this comment, so let me do some thinking for you, the copyright hold would have the right to transfer that copyright to another person, but if op dies the copyright is transfered to the public domain. Disney would buy it sooner not later. And if something's in the public domain it wouldn't matter since Disney literally started existence by adapting public domain works. The main benefit of buying it sooner instead of killing them is that it would ensure the exclusive rights to profit from the IP. (4 billion quid is for a matured idea, not a draft script that hasn't sold anything). (There's also the risk that the immature IP isn't worth anything even after murdering the op, also the obv papertrail of, op dies -> Disney releases movie faster than everyone else. And then the market saturation if the IP is matured).