"Apple may be reaching the saturation point (of the products it currently sells) among potential customers in some countries"
What is Apple's next move once it saturates the market?
Or, more generally, what is the next move once you've saturated a market?
There's plenty of more options available in both the short (<5yrs) and long term (>5yrs). They've previously had consumer product lines that included cameras, game consoles, laser printers, TVs, etc.. They could revisit those markets again, or push into business markets.
Really they could do anything.