Sure, they could make some colossal mistakes and get in a huge amount of debt, or some new competitor could come into cloud computing in a way we can't predict

Sure, they could make some colossal mistakes and get in a huge amount of debt, or some new competitor could come into cloud computing in a way we can't predict and Amazon can't compete with. The future is weird and things that seem like they will last forever can quickly vanish, and afterwards it seems inevitable.