On my flight through BOH yesterday I noticed, the airport has a brand new set of ground equipment on the ramp representing a significant investment by Rigby. They took their ground handling in-house in April. Hopefully this bodes well for further airline development. The inside of the departures terminal is quite large and could easily take 6 A320 sized aircraft simultaneously. There is a new Costa cafe and large restaurant area.
One positive thing about BOH is that due to the majority of its income coming from revenue streams other than airlines, I assume it can offer low fees/charges. I think this is something that SOU will never be able to do as they embark on their terminal and runway improvements. The cost of that development will need to be recouped from their only source of income - airlines.