Cordova devs had this to say just now in Slack:
Don’t update to Android Studio 3.0 or use the latest Android Gradle plugin, it will break your build and Cordova will not compile.
We are working on yet another fix for this issue, and there will be a 6.4.0 release for it soon, but as of right now, stick to the old version of Android Studio
BTW: If you do update your Android Studio and your Android Studio offers to upgrade your Gradle plugin, always say no
Issue for tracking the Cordova changes: https://issues.apache.org/jira/browse/CB-13289
So who updates anyway and tells us how it breaks?