Liverpool had a similar problem in the past , charter airlines were reluctant to offer many if any departures and when they did local travel agents were not always very tuned in to what was on offer from LPL and offered MAN.I think that is CWLs problem, persuading airlines like TUI and Thomas Cook to favour it over Bristol especially in the Newport area. I know TUI have expanded but BRS will always be their priority and Thomas Cook although offering more seats per flight with a bigger aircraft have cut the amount of flights rather than adding more.
A lot of people criticise CWL for it's lack of routes and frequencies on the routes it has but it can only provide what the airlines and holiday companies want to provide and if they choose to prioritise their flights and packages from other airports then i don't see what else they can do.
In the end they were all leapfrogged with the arrival on Easyjet and Ryanair. They proved that given the choice people are more than happy to fly from Liverpool. The travel agents and tour operators lost out.