Not sure any airline would leave a primary airport like BRS to set up a CWL operation thinking they will have a monopoly on JER from the South West by doing so. It is more likely a competitor (doesn't have to be EZY) would then come in to BRS to replace that lost link and everyone suffers.
Unfortunately this is a time for downsizing not expansion.
I agree fully that CWL has done a good job at not jumping into bed with the first airline knocking on the door. I see difficulty ahead for all three airlines that have done that at EXT, SOU, MME and BHD - Eastern, Loganair and Blue Islands. Some of those new routes have 0 pax on them or in the case of MME 3 or 4 at best. Come on people - this is not how you run an airline!