Google's interests lie in marginalizing the autonomy of the PC, with respect to online (preferably Google) servers, not selling the OS.
Google neither needs nor cares about all of the information having to be accessed through their servers, it only needs to be able to access it via its crawler. Google's AdSense network, which most websites use to get advertising bucks, is not dependent on hosting content on Google's servers. The only thing that is hosted is the search index. Google is quite happy to have you host the information yourself, as long as they can crawl it.
As an example, Google's largest initiative recently is the 'reinvention of email', which is Google Wave. Google Wave is completely federated, like SMTP. Anyone will be able to get the source of a Wave server, host their own accounts, and even host private conversations between two servers without Google being in the loop.
Also, they are able to pick up information about you through AdSense or Analytics, although in practice, Google's AdSense targeting is not behavior (based on tracking you) driven, but based on content. DoubleClick was based on behavioral tracking and traditional direct marketing techniques. The reason why AdSense works so well, is that the ads are served up based on the information you're looking at, not some kind of guess of what you desire based on knowing your age, gender, place of work, etc.
The hysteria over data logging is ironic, because Google's whole success is based on an advertising model that targets content rather than user profiles.
Google as an entity is setting itself up to have its tendrils throughout the information economy, from the point of use, the point of computation, data storage, commerce, communication, and news.
Who will everyone talk to, whose channels?
What's a greater threat of vendor lock-in at this point?
Well, as I pointed out, many of Google's initiatives do not mandate Google be involved. Anyone can download Android and remove all of the Google Apps integrations. Anyone can build their own version of Chrome that does not send a single packet of data to Google's network. Google Wave is federated and secure, and can be hidden completely from Google's crawler and logging.
Google's tendrils via it's open source and open specification initiatives can only be maintained with public participation. It's all too trivial to remove them. In fact, Google's whole FCC Auction gambit was designed to ensure that people could install whatever they want on phones without being firmware locked, which actually undermines the ability for Google to control Android forks on devices.
Let me just preface this with the fact that I have family members working for Google and I am privy to lots of internal discussions, as well as knowing lots of managers at Google due to prior working relationships. Googlers are practically indoctrinated from the point of hiring with "do no evil" culture run by a Department of Corporate Culture, that originates from the top down. People are encouraged to think how to engage the community, be open, and avoid lock in, which is why Google's products feature the lowest switching costs and lock-in of any company you'll find.
It's all well and fine for you to speculate in the absence of information about internal corporate dialog, but as ridiculous as it sounds, Google is run internally in a very academic and idealistic way and until the recent economic crash, there wasn't even much talk of even finding ways to monetize most Google products. Employees were encouraged to spend 20% of their time on side projects.
The company from my knowledge is not via traditional MBA-learned management techniques, but is more or less, a unique Silicon Valley creation. When you see Googler's pushing for these projects, think not about corporate planning at the top, but rather, idealistic young Stanford graduate employees who are religious about openness and bent on trying to change the world.
(and in case you think this is naivete, every Friday, Google has a company wide video conference/town hall, in which any employee can directly ask Sergey or Larry questions, and you will find quite a number of contentious employees worried about evilness forced by recent economic conditions, by an overemphasis on trying to monetize users too much)