Well to address your first paragraph maybe your showing you age as it is disillusioned beyond believe. How many of those flights you have listed are based? 1 Ryanair is the answer, which is likely to have only ever been based there to anoy flybe. They have moved into to numerous airports all round there country yet still are yet to comit to Bournemouth. They never will.
To address the rest of your post I agree its not impossible for Bournemouth to survive with this sort of business but it only exists as a result of the lack of real traffic. Look at Norwich and Southend as examples.