It seems that the youngsters that frequent such threads as this have little knowledge of how things were back in the late 20th century, when the UK skies were dominated by turbo prop operations of 50 seaters and smaller.
These days it seems the youngsters only recognise so called LoCo operations of brightly coloured jets and FlyBe.
Of course none of these LoCo's could make anything happen out of DSA because their business model is totally inappropriate, Manx (then BA) regional made a living out of Jetstream operations, Eastern seem to be doing OK out of it, and perhaps it's the perfect sized aircraft for such a commuter route out of DSA and it's an ideal route tester/builder to hopefully upgrade to larger equipment if the market justifies it.
Jetstream operations might also work out of NQY, they need something down there to accommodate their limited catchment area.