Google's quarterly results -- can it do that forever?

Google Inc.'s (NASDAQ:GOOG) latest quarterly results continue to drive home the point that maybe investors still cannot grasp, Jeckyl-n-Hyde style. Yes, the company had another blowout quarter that surpassed analyst expectations in every way -- which seems to be a non-stop function of every Google quarterly conference call.

And then the other cheek turns -- GOOG shares get slightly pummeled *because* the company did not blow past expectations by as much as was expected. What? Why weren't the expectations upped then? Not only some analysts, but the market sometimes operates on a principle of just not being able to be pleased. Nothing new to see here, so I'll move on.

Forbes.com indeed asks, can anything stop Google? Well, the company still makes nearly all its money in search advertising, and it's hard to believe that it can continue to literally handily beat expectations every single quarter -- even with all the new businesses and acquisitions it has entrenched itself in. Or can it? If Google is going to still have the goal of being the world's largest advertising company (that just happens be be a tech leader as well), can it survive on ad revenue alone -- forever? Perhaps it can -- or perhaps the bottom may fall out a little, albeit slowly.