I'd say it would result in either:
- the same scalability and availability with fewer DevOps engineers - better scalability and availability with a similar number or more DevOps engineers
In my experience, it's almost always the second case that happens. For example, a service would be moved from a few (virtualized or physical) servers that can only be scaled manually, to a k8s cluster with either autoscaling or at least scaling by changing a configuration file.