I'd say "Bring Scala to Android" would be more comparable? Bring Clojure and I'd say you're stealing a lot of developers away who think Swift is a half measure.
Performance is not just about the language; Scala and Clojure can be just as fast as Java on the Oracle JVM or OpenJDK. The Android Dalvik VM is just incredibly ineffective at optimisation compared to a real JVM, and Google has done little to improve it. Things might change with the new ART VM, however.