I don't really see Ryanair moving to Glasgow. If they did, let's be honest Prestwick as a commercial passenger airport, dies (again!). Hence he can demand anything from PIK and assume he'll get it as he knows that BAA Glasgow will still want a commercial return in the mid term. PIK don't have the same business model.
What he might do, is start a couple of routes from continental bases into GLA to put the fear of God into the management at PIK.
I notice that there are no huge "Ryanair" titles on the hangars. Are they like the Polar hangar, owned by the airport and leased to Ryanair? If so, I wonder who is taking the risk on this.