what is the future market share of Google in US?

Many predict google will have in excess of 80% , Even after US going on recession google has started investing heavily on various products. Recently they acquired Doubleclick a leading paid advertising company. They are now doing better in wireless market possibly stealing a share from Verizon in future. Back in the early 20th century many said Ford would be the dominant car manufacturer forever too. However, I think today GMC and Toyota would have something to say about that. Now, considering that Internet technology moves at light-speed compared to automotive technology... it should be a fair assessment that while Google is dominant now, 90% is pretty far fetch.