I have a little knowledge of Ezy GLA operations .
AFAIK the routes served from GLA have grown from 4 c.10 years ago to over 20 now .
One airframe was added in 2006 taking the total to 4 .So in that respect i guess you could call it "stagnant"
EZY will close any base ,large or small that does not meet there ROCE target . Previous closures have included Madrid and Rome , both substantially larger than GLA .
As to the future , who knows , the geo-political situation in Scotland does not encourage large inward investment . The cut proposed in APD would surely encourage all airline operators in Scotland to look afresh (if it ever happens )