I don’t think longtermism necessarily needs new priorities to be valuable if it offers a better perspective on existing ones (although I don’t think it does this well either).
Understanding what the far future might need is very difficult. If you’d asked someone 1000 years what they should focus on to benefit us, you’d get answers largely irrelevant to our needs today.[1] If you asked someone a little over 100 years ago their ideas might seem more intelligible and one guy was even perceptive enough to imagine nuclear weapons, although his optimism about what became known as mutually assured destruction setting the world free looks very wrong now, and people 100 years ago that did boring things focused on the current world did more for us than people dreaming of post-work utopias.
To that extent, the focus on x-risk seems quite reasonable: still existing is something we actually can reasonably believe will be valued by humans in a million years time[2] Of course, there are also over 8 billion reasons to try to avoid human extinction alive today (and most non-longtermists consider at least as far as their children) but longtermism makes arguments for it being more important than we think. This logically leads to willingness to allocate more money to x-risk causes, and consider more unconventional and highly unlikely approaches x-risk. This is a consideration, but in practice I’m not sure that it leads to better outcomes: some of the approaches to x-risk seeking funding make directionally different assumptions about whether more or less AGI is crucial to survival: they can’t both be right and the ‘very long shot’ proposals that only start to make sense if we introduce fantastically large numbers of humans to the benefit side of the equation look suspiciously like Pascal’s muggings.[3]
Plus people making longtermist arguments typically seem to attach fairly high probabilities to stuff like AGI that they’re working on in their own estimations, which if true would make their work entirely justifiable even focusing only on humans living today.
(A moot point but I’d have also thought that although the word ‘longtermist’ wasn’t coined until much later, Bostrom and to a lesser extent Parfit fit in with the description of longtermist philosophy. Of course they also weren’t the first people to write about x-risk)
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I suspect the main answers would be to do with religious prophecies or strengthening their no-longer-extant empire/state
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Notwithstanding fringe possibilities like the possibility humans in a million years might be better off not existing, or for impartial total utilitarians humanity might be displacing something capable of experiencing much higher aggregate welfare.
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Not just superficially in that someone is asking to suspend scepticism by invoking huge reward, but also that the huge rewards themselves make sense only if you believe in very specific claims about x-risk over the long term future being highly concentrated in the present (very large numbers of future humans in expectation or x-risk being nontrivial for any extended period of time might seem superficially uncontroversial possibilities but they’re actually strongly in conflict with each other).
I think this is generally true, but not sure that GiveWell is the best example of competition in social sector peers, since they seem mainly focused on hiring Western-based number crunchers who might otherwise be at a university or analysing financial data in the commercial sector, rather than poaching a small pool of educated staff from local NGOs or the best-networked, highest-performing grant fundraisers in the West.