Stock would have to go up almost 50%. Not impossible, but highly unlikely if there is not multiple expansion. Growth rate at that level would be very incredible. Like I said, not impossible...
Using Elliott waves, out of the 2003 low counts nearly complete. The shape of the chart since AAPL went public is a hockey stick. My proprietary digital signal processing filters also call for a top by the end of March 2015. As for the why this will happen, it is simply the change in investor sentiment.