You catch the airport bus from the travel interchange in Bournemouth centre and your nomore than 15 mins from the airport.
I can't see a 156 seat A319 making any money on this route. You'd need a 50 or 70 seat aircraft at most. SOU has domestic routes pretty much sewn up for this part of the UK. I think the talk of an Easy base at BOH of up to 6 aircraft is a little out of proportion!