also you dont think running at speeds that high could damage the Fan over time?
That always been up for debate on here so i doubt you'll get a straight answer.
For me, i would say: If it a bad quality fan, yes. It would have quickly in a short period of time. If it decent to high quality fan (most stock HS Fans are high quality. (im not talking about cooling performance, just the fan quality itself)) Then i doubt you'll notice the fan performance drop before you buy a new cpu.
Lets just say that my fan on a Intel P4 prescott (nicknamed presshot), can flex between 2800RMP to over 4200 RPM's and that been doing it for 5 years without a single rpm drop.
So i doubt that you'll notice the difference in the fan now @100% between now and a few years from now when a cpu change is in order.