CWL is only trying to gain back what it's lost transatlantic wise. It just wants to get back running and if it thought small it would never have attracted Qatar.
As for short haul that is growing especially the Flybe base. But if other airlines like Ryanair refuse to expand for as has been suggested for fear of harming Bristol or don't want to add more because of priorities elsewhere and in the case if Vueling because they maybe cautious or lack the bases of other airlines, the airport has limited options to grow.