"Let's just wait and see?"
Why not? They're being showered by the magic money fountain.
As to "make more use of the existing facility at PIK rather than expand GLA"? Well let me rephrase that :
Make more use of the airport the airlines want to serve rather than make them serve another more remote airfield they've had the option of serving for decades and still choose not to. No major commercial passenger airline outside of Ryanair use or even want to use PIK. This has been the core truth since 1994. The others who tried have mainly gone bust.
Globespan, Futura, Air Columbus, Air Wales, bmi Baby etc
So take as many diversion as you like. PIK has as ad-hoc value but commercially it remains a dead duck and not one fanboy on here has a remotely plausible business case to address that. I do not want to see PIK die but no one is being realistic here.