A widebody on any ABZ schedule would be overkill unless a one-off!
If HAH sell to Ferrovial, or anyone else, maybe we'll see expansion to see such a service. Or maybe for BAA/HAH, read Ferrovial, GIP etc. Meet the new boss...same as the old boss as Daltrey once sang.
Personally, I am doubtful - we don't know what the oil industry will be like in 12mths time, never mind 5yrs! There are some serious concerns coming to the fore.
I've always been dubious over the BAA's forecasts of passengers long term anyway.