It's difficult to use these stats to make a projection over time when they only represent one point in time. You can say that IE users click more right now, but their CTR rate is likely to change at the same time as the usage. It's likely that IE usage will continue to fall but will the CTR of other browsers increase as their usage rates climb?
Also, I don't see why experienced users would be less likely to click an ad that interests them. I've been using computers over 20 years and I click ads when I want to find out more about the product. I assume others do the same. How could someone be too experienced to click an ad?