This is for a person with no ML background. He is 55 years old, he liked the sequences and I recently managed to convince him that AI risk is serious by recommending a bunch of Lesswrong posts on it, but he still thinks it's astronomically unlikely that AGI is <80 years away.
There are a lot of other people like this, so I think it's valuable to know what the best explainer is, more than just in my case.
I don't know such source, but if I tried to create one, it would probably be a list of computer achievements, with years. Such as "defeats humans in chess", "defeats humans in go", "writes poetry", "draws pictures"... also some older ones, like "finds a travel route between cities", "makes a naive person believe they are talking to another human"... and ones that were not achieved yet, like "drives a car in traffic", "composes a popular song", "writes a popular book", "defeats a human army".
The achievements would be listed chronologically, the future ones only with a question mark (ordered by their estimated complexity). The idea would be to see that the distances between years are getting shorter recently. (That of course depends on which specific events you choose, which is why this isn't an argument, more like an intuition pump.) This could be further emphasized by drawing a timeline below the list, making big dots corresponding to the listed things (so you see the distances are getting smaller), and a question mark beyond 2022.