Even if search engines stop sending keywords in referral data, the ad networks and webmasters will still be able to piece together your browsing history. Every day there is less and less anonymity on the web, and for the most part people are ok with it. Ten years ago very few people would willingly use their real name online. Facebook changed that.
The web as we know it has been built on the assumption that search engines pass along keywords in referrer data. Changing this would have a significant negative impact on a lot of businesses. Considering that most users don't really seem to care about privacy, at least if you judge by actions and not what they say, I don't see why a company like Google would ever stop sending along keyword data to webmasters. They'll piss off webmasters who buy ads from them, and it won't help them increase their share of the search market.
The web as we know it has been built on the assumption that search engines pass along keywords in referrer data. Changing this would have a significant negative impact on a lot of businesses. Considering that most users don't really seem to care about privacy, at least if you judge by actions and not what they say, I don't see why a company like Google would ever stop sending along keyword data to webmasters. They'll piss off webmasters who buy ads from them, and it won't help them increase their share of the search market.