There is no future at the moment. Economy is weak, SNP in bed with the Greens so we're talking frequent flyer taxes and APD being cut or eliminated will now never happen. Constant uncertainty with indy and now lockdowns. SNP infatuation with Prestwick means we have a laughable situation of two sub standard airports representing a run of the mill city. Rail link will never happen to reduce the M8/74 bottleneck. The management are useless. Aberdeen, Glasgow, Southampton all struggling, spot a pattern? Be as well blowing it up and building it somewhere east to ever give a chance of competing again. As stated above and elsewhere several times the place is needing more than a lick of paint and its debatable whether the owners have the desire to invest or even realise what the place looks like to an outsider.
There's so many factors against the airport now that you have to question its long term viability. Derek Provan said their airports are losing around 3m a month currently. I don't see any signs of major recovery on the way post covid. All about survival now. There's no wave or routes or base openings to stem the bleeding or provide optimism.
The airport will probably exist, just about. You'll still have shuttle service to above named hubs and maybe some UK/Ireland regional travel at the expense of the tax payer and a few flights to the Costas. Cuts will continue. My prediction in the next medium term is UA leave completely and the seeds will be sown for Emirates to concentrate on the east like the transatlantic Airlines have. God forbid Loganair goes bust! If EZY can shut Newcastle they'll look at Glasgow as its market share further shrinks.
We have an Irish model of aviation now in Scotland with one dominant airport, however without the hub status or the infrastructure to go with it. A total shambles.