Still it would be difficult to continue there if infratil closes it
Dear me, have they suggested anywhere this is an option?
Lasham has a fair amount of maintenance and no commercial traffic, if the Terminal were to be closed as a going concern, that's not the same thing as the airfield as I suspect you know. Cargo, local flying and HMS Gannet would remain and any transit stops could happily be handled from the current Aprons on Golf and Hotel, with the Antonovs on the North Side. None of this has anything to do with the Terminal. Hence there is a business case to continue the airfield operating with no passengers, it's not a new thing for PIK to be honest.
This would also allow maintenance to continue in the BA hangar and whoever takes the Ryanair four bay hangar, assuming Ryanair don't maintain a single daily PIK-DUB to take advantage of the current facilities for maintenance rotation.
I lived through PIK in the 90s, I have see things worse !!!