That’s certainly not my understanding…..it’s a case of watch this space one the terminal developments complete….The airport aren't interested in giving people choice, they want bums on seats, and that's bucket and spade flights. They've all but conceded the premium/business flyer market to over the hill. Fair play for them for cutting their cloth accordingly, no point wasting time and money trying to attract airlines that won't work out in the long term. As has been stated elsewhere the only really feasible scheduled/legacy operation that would work from LBA would be a TK/AJet/Pegasus type connecting service through IST/SAW. Of your list MAD would be the most likely, with a lo-co operator. But Germany, forget about it.
As for jet2 - you only need to read the comments now on their social media channels….previously they were mostly positive riding on the back of their Covid response. That good will looks to be diminishing fast and now replaced with complaints over their flight time schedules, high prices and the loss of services such as the resort checkin service. It certainly doesn't seem this is just an LBA issue with jet2.