I've considered that, but discarded the notion. At a P/E of about 12 (discounting for $60 billion in cash holdings) it can hardly be called a bubble. I think Apple's quiet nature leaves the stock to react negatively to negative news put out by competitors and media haters.
Actually, the success of Android is prima-fascia evidence of an inability to execute. Rather than developing something really great, they just ship free software they downloaded from the internet (Android) and call it a product...total lack of execution.