I agree with your points. Matter of fact I typically side with companies like Google and say "good for you" for building an empire.
There is a fine line between extreme success and a monopoly. Is Google a monopoly? Maybe, maybe not.
Just as a single example. The boom of travel sites, ie. travelocity, orbitz, etc. Think of how they put travel agents out of buiness. Now enter Google offering direct purchase flights from thier search queries. Exit Travelocity and Orbitz.
Call it evolution i suppose.
Problem is Google is in practically everything. Search for movie times...no need to click fandango, now you can buy you tickets straight from Google.
Kind of scary really.