Why search engines?!

Would you think the following things could make any sense?

1. Web pages could be indexed and ranked, and these ranked indexes
could be distributed to the systems across the web as torrents.

2. Web clients (browsers) could be used in ranking web pages. The
amount of time user spent on particular web page could be calculated
from the status of active browser window/tab.

3. No one bothers which DNS server he is using, why bother which web
index you are using or how it got ranked?

Thanks.