You are thinking too narrow...

Well let's explain a bit...

There are lots of sites (LOTS!) who exist by the very income they get by Google Ad's, for some big sites this could mean the end and even for the small ones.

There also are lots of travel sites who use google maps for showing where a travel leads to and so on. Not being able to offer this feature would actually decrease sales.

Many, many websites and companys are also only runing because of their high google rank. They depend on people that search on google for a specific term and get to their website, whereas other search engines might not even list them. Google being down for a week could mean a big decrease in income or even the end.

[edit]Inspired by 4eyes post: There are even companies who get jobs from mails, and some use google mail, I can see that very often here. They would earn less aswell.[/edit]

I could list hundreds of more things. But if you think wider than your "ill just use another search engine", then you can actually see, how dependant our todays world is on google. (Even I would lose my job, we ARE dependant on google, just as many others are)

Think about it