Skipness One Foxtrot
the checkin area is no big deal really, the atrium/self service area of N terminal zone A was modified for VS but wouldn’t take much to make it generic again. As for their lounges in the 4th floor, not sure GAL would, as mentioned above would mothball in case VS return. On the other hand, not sure what use the 4th floor lounges would have for anyone else in the N terminal. You already have mylounge and number1 lounge, Emirates (a smaller operation) and aspire lounges on other levels
with demand lower for years to come and lack of ‘premium’ airlines, I can’t see any use for the ex VS lounges in the N terminal