Surely with Bournemouth its the age old situation of supply and demand? It's ok ryanair coming along and offering a few thousand seats at a pound a go but that doesn't spell longevity.
As mentioned by other posters Bounremouth should be targetting the bucket and spade routes that Southampton doesn't cater for. I guess with the recession this area of the market has seen the most erosion so perhaps why Bournemouth has an empty apron.