> Is global economic collapse not an eschatological scenario?

Not really, no. In this case 20-25% of the world's oil disappearing doesn't sound like it should be an 'everything collapses' scenario, we still have >75% of the oil around and oil isn't the only energy source. Everyone has always seen a "worst economic collapse of my lifetime" and although this one looks like it is going to be unusually horrific it isn't going to cause the end of anything structural unless there are other causes already in place. For example in theory this might be the end of the US military's ability to maintain global order in the same way as the Suiz Crisis humiliated the British empire - it'd be a recognition of realities on the ground rather than the current crisis changing anything.