bb: comparing two different stats there. The ones I was using are total CAT movements, including air taxi. The ones you quote are non-air taxi. Air taxi includes charters by aircraft as big as Do328 and Saab 340 so perhaps a bit of a misnomer.
As an update to the last, Southend lost their CAS in 1992 when they were running at 4589 total CAT movements, so not that far off DSA's current levels.
DAP would have to respond if there were submissions from e.g. BGA, AOPA, LAA etc to withdraw DSA's CAS. But I suspect their attitude to withdrawing CAS from an airport with pax schedules will be rather different to what it was in the 90s when we were all so much more risk-tolerant.
NS