I think everyone agrees about "non-certainty". Where people disagree is on how likely an intelligence explosion is; and in particular, whether it is likely enough to warrant expending effort to plan for it.
We don't know enough to know whether it's possible. If it is, we don't know enough to know what approach to follow to get there.
Is it worth spending effort to plan for it? Maybe some. But if we don't know what approach to follow to get there, we don't know what it's capabilities and limitations will be. That means we don't know what we have to plan for. Any planning will therefore be either very speculative or very abstract.
I wouldn't start pouring effort into planning for it, as if were the most important problem in the world...
Is it worth spending effort to plan for it? Maybe some. But if we don't know what approach to follow to get there, we don't know what it's capabilities and limitations will be. That means we don't know what we have to plan for. Any planning will therefore be either very speculative or very abstract.
I wouldn't start pouring effort into planning for it, as if were the most important problem in the world...