We're not acting like that. We're saying it may as well be that way for most people. You and I would be fine if Google disappeared. We'd just switch our auto search to Bing/Duck Duck Go/Blekko and never look back. But most "non-technical" people are dependent on Google, and if they wanted to use Bing, they would have to either search "Bing" on Google and click the link in the results or find a nerd to set it up for them.
Real World Example: Some relative of my girlfriend set up her mom's computer to use Yahoo. But she has since been convinced that Google is better and she should use that. So what does she do? Every time she starts up her web browser, she types "google" into the Yahoo search box, clicks the link to go to the Google homepage, then does her search there.
People can learn. It's not like they would never be able to use their computers again. They'd call their daughter and she'd be like "oh, click on that little arrow and click on 'yahoo'".
Yeah, if any major service that millions of people used every day disappeared, there would be a period of adjustment. But that's all... a period of adjustment.
Real World Example: Some relative of my girlfriend set up her mom's computer to use Yahoo. But she has since been convinced that Google is better and she should use that. So what does she do? Every time she starts up her web browser, she types "google" into the Yahoo search box, clicks the link to go to the Google homepage, then does her search there.