It isn't only a matter of steering geometry.
A standard rigid fork will be roughly 3" shorter axle to crown than a comparable 65mm travel suspension fork. That would drop the entire front end of the bike 3", changing not only the steering geometry by about 4°, but also the handlebar height, which can be an issue for many people.
It'll also lower pedal to ground clearance by 1" or so. And will move the saddle forward with respect to the bottom bracket buy about 1-1/2". So while it the changes may "not be enough to worry about" someone about to make the replace the fork, should be aware of the, possibly unanticipated, consequences. After that it's his choice.
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Last edited by FBinNY; 07-25-10 at 09:59 AM.