Wow, what a ridiculous supposition! Apple wouldn't be motivated to improve or innovate without a "threat"? You clearly don't understand them as a company at all.
Even though I agree with the basic notion that 'healthy competition is a good thing' you took it into pretty faulty territory. The history of Apple all by itself proves you wrong in that regard. They are not, nor have they ever been "threat driven" in their product development.
Your Apple history is very weak.
During most of Apple's history they have been fighting the major platforms for market share.
Only with their iDevices have Apple lead significantly in Sales and profits.