They made the right call at the time, given that the alternative to was to archive every tape and stack up a nontrivial fraction of the BBC's budget in a vault in preparation for applications that didn't exist.
Most media go through a period where the recording format is too valuable not to reuse (magnetic tape) or too fragile to store (nitrocellulose film, early print). Some day maybe we'll invent a way to record brain patterns, but I'm inclined to expect it'll be in a medium like defect-free carbon-hassium nanocrystals that cost $500,000 each. I don't doubt that some re-recording in whatever technology we come up with.
NASA recorded over the Moon Landing masters, at a time when they were better-funded than they have ever been. The BBC is in good company.