Kevin points to a proposed Google Autolink Opt-Out Metatag.
meta name="ContentAltering" content="{restrictions}"
We already saw how effective the Web can be at getting these changes implemented (in the nofollow attribute), so it would not surprise me in the least to see Google follow suit here. It sets an important precedent, as anyone who follows in the Autolink footsteps will also have the pressure of supporting this tag.
I don't think I would actually use that here - I'm not sure what good it really does me - but hopefully Google recognizes the potential implications that changing web content can have and embraces this.