The problem with DSA is that it is heavily reliant on Wizz. It makes up for over half the passengers.
They are clearly intent on scaling back their operation to DSA, judging by the routes cut and the significant frequency cuts on the routes that remain.
Then you have Flybe, who have scaled back since they first started, and it remains to be seen whether DSA is anything more than a dumping ground for their Embraers.
TUI are the only ones who seem 100% committed.
As pointed out earlier, I only see a future in freight, with maybe the odd token passenger flight.