For me, Oracle is not as good of a stewart of Java as Microsoft is of .Net.

I wouldn't waste my time converting from a Java infrastructure to a .Net infrastructure and if I were a Linux shop, I probably would stick with Java for awhile, but if I'm already using Windows servers or have my choice today of using Windows only for the backend, I would definitely chose it because of the number of devs and network people available.

I know why you said Java. But I pretty expressly didn't, because BigCorp won't know or care why you said Java. Technical smugness doesn't change the fact that Scala and Clojure are exotic, and that exotic carries risk.