In the absence of ads-that-are-obviously-ads don't you think that clever marketers would just migrate to native ads disguised as content? There's something to be said for a clear line of separation between ads and content. It seems naive to think that the concept of ''advertising'' would ever be eliminated full stop, given how human nature works.

You might enjoy this read, which an MD friend of mine sent to me the other day:

http://slatestarcodex.com/2015/02/17/pharma-virumque/