This reminds me of "Javascript everywhere". Technically yes, but I don't think that language is a main issue for being able to develop both client and server part of the app. Languages can be picked up in a matter of weeks, concepts like good api design, choosing the right database, deployment etc are the real challenge.
You are right of course. I still think it is great proposition for at least Apple platform. For client side Apple will push it for greatness for server side it is still too early.
