And if any company has a track record over the past decade of delivering "big things" it's Apple. No company in recent history comes even close. Can they? Who knows, but if anyone can, it's Apple.
I think your comment is a bit of hyperbole, the success of a company like Apple is not unprecedented in history. Apple could continue doing "big things" over the next decade, I just seriously doubt their ability to continue their growth and justify their market cap over the next 5-10 years. That's all. Possible, yes, in my opinion extremely, extremely unlikely.
And also like clockwork, I had a comment explaining why I thought they would fail, and have downvotes.
Apple is not afraid to kill its cash cow if they think they have a better product in line—see how they dealt with iPod line before the iPhone—they were replacing the most popular model with something new.
I have no doubt Jobs has a vision many years into the future. It was amazing to watch his 1997 WWDC keynote and realize that now we see the fruits of his thoughts then.