It won't open the door for anyone at PIK, may help load factors with BA/BD/EJ at Glasgow though, on existing flights.
As was mentioned earlier elsewhere, the pre-7am flights are largely unreachable on public transport and £1 flights seem to be a thing of the past, PIK losing its appeal as the savings are squeezed. (EJ to London from GLA frequently available <£50)
I know Ryanair are hardly a conventional Hub and Spoke airline but the direct choice from PIK is relatively poor.
Less flights to DUB and STN greatly reduces the possibilities for efficient 2 leg flights.