Oh Apple will fall, of that there can be no doubt.
Pretty much every company has it's golden moment and it's Apple's turn now.
We just see things over too short a time frame to see the happening, but it will.
Its true, eventually all company's decline..look at GE and Microsoft..they were once at the top. For now it looks like Apple hasn't come close to peaking. In their most dominent product, the iPad, they 'only' have about 70% of the market. They have room for growth in many of their products.