Hi glasgowpik and welcome to pprune!!
I've been thinking exactly the same as you but to be honest the last time I flew from Prestwick was in March to Charleroi. The departure lounge was overcrowded to say the least. This was due to a new bar that was taking up space previously occupied by seats. The seats that were there were far too close together. Many people had no choice but to stand until their flight was called. I think that the departure lounge will have to be expanded before new routes are announced by any airline. I haven't been in the airport since March so maybe someone could tell me if things have improved in any way since then.