The big worry is why could Primera not make these routes work for them over the height of the season? Or just
PR spin as they had so much egg on face over their blink and you miss them TATL ops. It does not send a positive message to the few other airlines who could step in about BHX being a money spinner.
Who says BHX was a money spinner in 2017?? I would suggest that if anything there was over capacity and as a result too many cheap fares, and nobody making adequate money on Med routes in particular.
There is a happy medium to be achieved, and BHX is probably in a better position now, with controlled expansion by one major carrier, in Jet2 than having another upstart piling in on the same old markets and creating too much capacity too quickly.