In the long run, Google and Amazon still have a leg up on Apple due to the fact that they can almost give away their tablet and still make some money in the long run.
That will always be the case until Apple does something a little different.
They tried with the iAd thing to somewhat compete with Google with the Ad money. That did not work.
They really have no solution in place yet to compete with Amazon, YET.
With time, that will continue to wash away profits. ...