In a nutshell there isn't a hub in Hawaii as....

- Population is only ~1.3 Million.
- Nearest shorthaul destination probably 2000+ miles.
- Traffic mainly leisure and not business.

Whilst FTers might love a BA service to HNL for redemptions it doesn't make any sense for BA commercially or operationally.

Unless BA can get much higher fares in significant numbers (in the premium cabins) for say LHR-LAX-HNL-LAX-LHR rather than LHR-LAX-LHR, it makes no commercial sense to run LAX-HNL-LAX on BA. In fact BA would almost certainly have to cut the fares in premium cabins for LHR-HNL-LHR tickets, compared to LHR-LAX-LHR tickets to get bums on seats.

The demographics of the catchment area for LAX compared to HNL mean that LAX wins hands down every time and the same goes for every other US destination BA currently serves.

I'm think that Virgin and BA still only run to SYD because neither wants to be the first to drop the route.