Yes they can co exist. aapl just wont have as much market share as they did 4 years ago. The pie is being shared & divided between aapl, nokia, msft, android & RIMM making a comeback.
with that said.. aapl should be valued around $3-$400....
Not saying there no good..they just not dominant anymore.
Its just how tech works... Things in the tech world can easily become dinosaurs or obsolete. Tech is constantly changing