IDK. And FWIW I'm not even sure that the leaders of those organizations all agree on the type and severity of risks, or the actions that should be taken.

You could take the survey approach. I think a good survey would need to at least have cross tabs for experience level, experience type, and whether the person directly works on safety with sub-samples for both industry and academia, and perhaps again for specific industries.

Also, the survey needs to be more specific. What does 5% mean? Why 2035 instead of 2055? Those questions invite wild ass guessing, with the amount of consideration ranging from "sure seems reasonable" to "I spend weeks thinking about the roadmap from here to there". And self-identified confidence intervals aren't enough, because those might also be wild ass guesses.

If I answered these questions, I would give massive intervals that basically mean "IDK and if I'm honest I don't know how others think they have informed opinions on half these questions". I suspect a lot of the respondents felt that way, but because of the design, we have no way of knowing.

Instead of asking for a timeframe or percent, which is fraught, ask about opinions on specific actionable policies. Or at least invite an opportunity to say "I am just guessing, haven't thought much about this, and [do / do not] believe drastic action is a good idea"