Didn't I recently hear something about Google rebuilding Android to remove Java? Or am I totally off?
I also suspect that OpenJDK's license might bite them in problematic ways, or they would have either done that to start or not had such difficulty negotiating an agreement under whatever terms Java possessed that Google might have wanted alternatives for.
True. It does prevent damages going forward, however, and it removes Oracle's biggest club - a court order forbidding any further shipments of Android.