The problem with the Clarke quote:
"When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong" is that things that have already been achieved are then given as examples of it's veracity - e.g. predictions made by some about space travel in the late 50's and then the subsequent Moon landings...
Problem is the Clarke quote never gets used in the context of, say, predictions about the use of controlled
contained sustained nuclear fusion for domestic power....something that just like full blown AI has often been said to be just "around the corner" for decades...
https://slate.com/technology/2013/01...ess-power.html