3rd Rock from the sun i am sure has been on here with other user names and got booted off. Your post was going ok till the last paragraph.
BOH could support 4-5 based aircraft, serving domestic and European routes without having a detrimental effect on SOU or BRS. ( very few people from South East Dorset use BRS...it has worse access than even BOH !). The trouble in the past has been the wrong type of aircraft ( 737-800 far too large for domestic routes) and some strange routes ( Krakow,Grenoble,Hahn, Katowice).
I am sure MAG will get its act together over the next 2-3 years and BOH will develop again. 3 million passengers a year was too high a forecast but can see a steady 2 million in the next five years.