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The British aviation industry in 1956 basically had one customer — the government. (The airlines had been nationalized to keep them alive; plus the military.) I'll concede that the Air Ministry was lousy at predicting requirements 30 years ahead ...
They sold 438 Vickers Viscounts to over 70 operators. They were hoping the Concorde would be a similar export win.
There were > 120 expiry orders for Concorde in 1973. Then the OPEC crisis hit. (Causes of Concorde's failure aren't simple — it's not enough to blame central planning.)
Yes, order book was full, but OPEC + Sonic Booms made land legs untenable. Flying was still novel too, making Time-in-the-Air less of a factor.
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