From the "good for us" perspective, the community would not miss the company's leadership on Linux Container standardization nearly as much as the aggregation service that is DockerHub. But from the "good for the acquiring company" perspective, who would care? A GitHub or a RedHat has the mission and user base where it might make sense, but both companies already have plenty of their own infrastructure tooling. I'm also not sure either company would bid very hard against an Oracle or Google.
The most strategic acquirer sounds to my ear like Microsoft. Their recent Linux compatibility investments prove they might actually Extend instead of Extinguish. We've gotten some time to get used to Microsoft not being The Enemy anymore. Heck, you could even say I'd be a little enthusiastic if this news dropped.