This seems apparent currently, but I feel that this is obviously a concern to all who publish PPC content (i.e. Google, Yahoo, etc...)
The "search" landscape will change so drastically that this hopefully will not be as big of a concern. As historical data and demographic data expand and become more accurate, I would be more inclined to believe that you will see extremely targeted products offered in similar models like comparison sites that give precedent to price and are still visual ppc product ads. But this should change where instead of a price precedent making it the attributes of product data coupled with the historic demographic data (age, wages, trend, lifestyle, etc...)
I forsee an integration into our daily mobile devices (which has begun now), where the advertising is so powerful that you obtain realtime information and special coupons / discounts to consumers just because they are in that specific location, which could drive conversion.
If someone would hurry up and purchase the 700 mhz spectrum http://en.wikipedia.org/wiki/700_MHz_wireless_spectrum_auction
development of new infrastructures could commence and the "internet" space as we know it would drastically change, where exists the possbililty of keen advertising fully supporting this environment providing 100% free "internet" to users, driving off and online sales, a more educated individual where information is at their fingertips at all times.
We may not even call it the internet but just refer to finding things as we almost do today with the term "google it", a kid will say to another "Man I reall want that new pair of Duncan's, I wonder if anyone has them on sale?" the other kid says "I don't know, let me look it up"
Where "look it up" is referring to the "internet" search he/she performs through a voice command which parses the sentence and brings a comparison of online and offline retailers with breakdowns of location, price, reviews, etc...