Apple passed Exxon today to become the most valuable company on earth.  The excitemnt only lasted a few hours until the market rally at the end of the day put Exxon back on top, however.  But, that didn’t stop people wondering: What’s next for Apple?

Enter Robert Cyran, Columnist for Reuters, who doesn’t understand why Apple isn’t headed straight towards being the first $1Trillion company.

So, what’s the deal? Apple, if put on the same P/E multiple it traded on in 2006, would be worth $900 billion.

And who has brighter prospects than Apple right now?

In getting to the conclusion that investors simply can’t wrap their head around a $1 trillion company, Cyran discounts the uncertainty in leadership, which unfortunately may not be insignificant: