No, I don’t think they are semantically very different. This seems like nitpicking. Obviously “they are likely to encounter” has to have some sort of time horizon attached to it, otherwise it would include times well past the heat death of the universe, or something.
It was not at all clear to me that you intended “they are likely to encounter” to have some sort of time horizon attached to it (as opposed to some other kind of restriction, or that you meant something pretty different from the literal meaning, or that your argument/idea itself was wrong), and it’s still not clear to me what sort of time horizon you have in mind.
No, I don’t think they are semantically very different. This seems like nitpicking. Obviously “they are likely to encounter” has to have some sort of time horizon attached to it, otherwise it would include times well past the heat death of the universe, or something.
It was not at all clear to me that you intended “they are likely to encounter” to have some sort of time horizon attached to it (as opposed to some other kind of restriction, or that you meant something pretty different from the literal meaning, or that your argument/idea itself was wrong), and it’s still not clear to me what sort of time horizon you have in mind.
The AI system builders’ time horizon seems to be a reasonable starting point