The service reduction for summer 2015, from 4 to 3 per day probably reflects the woes of its parent rather than those of EDI.
Possibly, but don't forget there's been an increase in competition out of EDI recently.
They now have Turkish and Qatar to compete with for transfer passengers heading to Asia, with Etihad to join them next summer. They also have AA/US competing on flights to the USA, as well as increased frequencies and destinations from United.