Businesses come and go. I admit I don’t know how many gates Lufthansa acquired when competitors went out of business or were acquired by them, how many have been theirs since each terminal opened. Since in the past they were smaller, it is obvious that gates are something that can be acquired. Maybe not on the ideal schedule, but such is life.
Brussels Airport has plenty of expansion planned. Airports get bigger over time, not smaller.
Now your have to re-route your whole airline network.
The value is in terms of not bankrupting your company.