This is jsut the tip of the iceberg, in my opinion. Since Google is now required to grow it's revenues non-stop to please investors (and since it's only source of income is adwords), I think we can expect a heck of alot more emphasis placed on commercial results in each search. In fact, it wouldn't surprise me in the least if they start making the top 2-3 ads look more like natural listings - to make advertisers pay that much more for them.
Up next - the "new and improved" adwords which will place a minimum bid threshold on keywords base on their own internal stats. How many people think they'll be able to find any $.05 keywords when that happens. My guess is the minimum will proabably double on most commercial keywords.
Until google can figur out how to create additional income streams, prepare for adwords to start dominating everything.