Hi, P95carry,
This concern mostly arises because most of us have seen old falling block and tip up .22 rifles that have badly battered chamber faces. But those guns were sold for all of $.50 at one time, the parts are soft iron, and thousands of them had their firing pins replaced by nails. They are not good indicators of the state of the art in modern rimfires.
I think your concern is unnecessary, because in well made rimfire guns the firing pin is stopped well short of the barrel face, in fact usually by about 1/2 the thickness of the rim. This is easily checked by using a little dykem blue to look for contact, or by measuring firing pin indentation in wax. For example, a K-22 frame-mounted pin simply cannot reach into the countersink far enough to hit the edge. A Ruger standard model auto firing pin is stopped by a thick crosspin, well short of the chamber edge. Other guns have similar setups.
Can extensive dry firing ultimately batter or break something? Maybe, but in practical terms that doesn't happen. For example, I have "fired" a K-22 in DA practice for at least 10K "snaps" with no damage. I probably have "snapped" an S&W M41 and a Ruger MkI each half that, at least, again with no damage.
This issue usually comes up in the form of a question on whether a gun should be left cocked after a shooting session to avoid dry firing. In that case we are talking about so little dry firing that no damage could possibly result.
So, if you are going to be doing long term dry firing, hundreds of "shots" a day, your concern might be valid, and I would keep a check on the gun. But if you are worrying about an occasional dry fire to let a hammer down, or a few "snaps" for sight alignment practice, you could be just a bit paranoid.
Jim