Don't take a 5 years old thing as indication for the present :)
Startups had a drop in activity at this time an noone to take care of it, hence its closure (as was its previous iteration, as explained here).
Quoting Robert Harvey (now no longer part of SE along with Shog9) from meta:
As discussed in: Graduation, site closure, and a clearer outlook on the health of SE sites, just about the only criteria remaining to keep a site open is having enough users (three minimum) willing to step up to Moderate♦ it.
In my opinion, Stack Overflow the company won't close something as long as it drives traffic to show ads as that's mostly the only thing they have interest in now, building communities and good quality knowledge bases is no longer their goal.
Late addition: I just seen This MSO question which seems to mean the company would like to combine this site along with others under StackOverflow "brand". My sad interpretation of their behavior in paragraph above would be confirmed if they close devops.se in favor of a devops-* tags in StackOverflow.