Working in corporate and government environments is an Apple free zone.
Lower price competitors have repeatedly caught up and outperformed higher priced vertical companies that make the entire stack. Android is well positioned to do exactly this to Apple over the next decade. Phones and cheaper devices also seem to see this happen repeatedly. Apple's phone division should see a warning in Nokia and RIM, not a comfort.
SGI, Sun, Commodore, Atari, DEC and many others are all defunct. All full stack companies.
Apple and IBM are left. IBM mainframes are extremely difficult to remove. Apple are easier but may survive with enough iOS lock in.
But you'd be very brave to bet on it.