SKOJB
I would say it is incredibly unlikely. I think Southampton will prove to be successful for them and a nice little niche market but I'm not sure it will be persuade them into going full time. I'm not sure LCY is behind with capacity, quite the opposite in fact at the moment?
BACF are, ultimately, only there because of the weekday restrictions at City and the the crewing nightmares they had with the Bristol and Birmingham and Manchester operations. Being stuck in a taxi from Bristol back to LCY airport after a busy weekend flying is not the best way to achieve a harmonious crew!
If City ever goes 7 days a week I'm sure they will probably focus their entire operation from there and stop with the weekend ops from other airports.