Good luck to the planning application ,but realistically it's never going to happen,as stated if this was 10 years ago then maybe,but it's not and the climate has changed.
Expect major objections and eventual withdraw of the application.Where does this leave SOU?,well it certainly won't be around after another 10 years.
It makes sense to develop transport links to BOU,it has the runway,location and facilities to become a mini Gatwick!.Investment will come through. SOU had its chance many years ago,but poor management,lack of investment and oversight has silled it's fate.