Unfortunately I agree with the 'never going to happen' camp.
The airport is a pain to operate from. Limited hours, especially weekends. Over zealous ramp management. Commercial aviation and Airbus owned facilities wouldn't mix well. It's health and safety gone mad.
Back when Highland Airways did the Anglesey run they looked at tying in a lunchtime Hawarden run but were told by the airport in no uncertain terms they weren't interested in commercial traffic. Though that's obviously changed perhaps.
I've seen the terminal, forget A319/737 Chris. And I doubt it would work like you envisage. More like Airbus would see it as an opportunity to cover their overheads completely.
If anything were to go ahead it would need to be another heavily subsidised assembly member transportation service. Mind you they need to do something with CWL so you never know!