most would react with horror if told to do something like this out of the blue; but with correct conditioning from the FDS, probably most anything would be willingly obeyed in time.
Not all the Jones people drank the poison...some of them ran, escaped.
Same with the JWs and their brand of Kool-Aid. One of the most damning things of the JWs is the blood doctrine. The expectation is that you should be willing to die or allow your child to die to prove your faithfulness. Stripped down to the core, it's not much different than being expected to drink poisoned juice.
I think a good many JWs buckle when it comes to the blood issue. Yes, some refuse...some die. But the WT cult is different than The People's Temple. Those folks literally removed themselves from the world and lived in a commune under the direct rule of Jones. JWs, while indoctrinated to serve the WTS, are not under constant supervision or survellaince. They are more open to move about and even think for themselves, if they so choose. With that relative freedom when push comes to shove I think many of them are not indoctrinated enough to die for the WT corporation. And the blood doctrine is one of the older WT statutes on the books. It has been ingrained in dubs for decades. But even still many see problems with it and secretly ignore the rules.
For the WTS to try to come up with some new "Kool-Aid" it would take a couple of generations before they could exercise that control over the people. So I don't think there would be any sudden dictate to the followers that would be followed without question. I think many would balk and be quite vocal about it. At least I hope they would...