Where Does It Stop?

As everyone can tell from my previous posts and comments, my one question has been where does it stop? When does tracking become intrusive and an invasion of privacy? Obviously each persons answer will be different as everyone's comfort level will vary. But one thing has become increasingly clear to me from the reading we have been doing...the internet and its affiliates are still pushing, still progressing, waiting to see when they will cross enough people's comfort zones to be stopped.
As in the article "The Web's New Gold Mine : Your Secrets" states "Tracking tecnology is getting smarter and more intrusive. Monitoring used to be limited to cookie files that record websites people visit. But the Journal found new tools that scan in real time what people are doing on a web page, then instantly assess location, income, shopping interests, even medical conditions." I find this a little scary. When you think back to 1994 when cookies were first introduced, their purpose at the time was innocent...to help remember contents of web shopping carts. But as with anything anymore, someone quickly found a way to use it to make money and within a year it's purpose was no longer innocent.
When you study the progression of tracking it steadily becomes more detailed and intrusive. So far not enough people are uncomfortable with its level of invasion to do anything about it. However, don't kid yourself into thinking its going to stop there. Right now your name and face aren't up for sale but honestly folks, how long do you think it will be before it is...?