I think any airline is nervous in starting new routes out of UK airports, I would say this is why BHX has been hit hard, mainly due to the damaging £12 tax on short haul aviation. For Ryanair, at this moment in time the money is in BHX-sun sun sun and central/eastern Europe.
BHX is the most confusing airport in the UK, it has such a massive catchment area and yet cant sustain these routes. Maybe its time to start some hard incentives to draw airlines in. Or do these exist already?
The next problem BHX may have (and I stress may) is if CVT gets it's act together and attracts a few loco flights.