That's true, the world is not there yet though. I'm planning something like this some time soon, but life tends to get in the way.
I think a collection of integrated stack would be very interesting. Much like we have small recovery linux distribution, server distribution and desktop-oriented distribution. Like, distrib of webservice, of webservice + frontend framework + end-to-end stack java (thinking GWT or Zk here), ...
Meteor is trying to create something like this, but I feel the focus should be more to integrate community projects (they say they do, but in reality they don't), not building everything from the scratch.