It looks as though from the report written by Flybe that SOU could benefit from their exit from LGW and future cost-cutting, it suggests there could be more year-round leisure flying with the E195's and also that they will look to target a number of key business routes served by LHR/LGW. It also says they will look to target volume over yields a little more which should bring in some less expensive fares!
On a more local scale I would say we could potentially see an extra daily rotation to BHD and NCL next summer when the LGW routes are dropped as they no longer have to worry about keeping enough passengers on the LGW routes, and for the point-point passenger SOU is a reasonable alternative, and the extra flexibility offered would make it more attractive to the passengers who usually head London-wards for their UK travels. IOM is another route which we may see an increase on and also GCI/JER although this would depend on how much overlap there is/was with the LGW routes.
Link to report:
http://www.flybe.com/corporate/inves...e-May-2013.pdf