Great news for CWL, I think it will sell well and hazard a guess that more marginal FR routes will appear before the winter starts, this will be a dip your toe job, as already mentioned plenty of spare FR aircraft about over the winter so why not utilise them on some new routes and test the market, with the hoards of Welsh pax through BRS there is and always will be a market for these routes.
Also if pax are looking for less or more than 7 nights then it is not a major issue to book out of CWL in to BRS or vice versa especially with the Greyhound services to BRS from Cardiff.
How long before the DUB route returns? Not long I would guess