I've wondered this too. I'm sure Apple _is_ working on something like this (or a dozen something's like this), but they aren't going around blabbing about it to everyone who will listen. Seems like all this does is publicize a failure if they never get it to work, or take all the luster off the release of an awesome new product.
You should read up on The Lean Startup by Eric Ries. Google's strategy to release everything in pre-alpha stage, then slowly improve it from user feedback -- might not be the optimal marketing strategy that Apple perfected. But it's the optimal strategy to build an actual great product.
