Should MLB rules be changed to protect the catcher?

[Art161]

Should Major League Baseball rules be changed to protect the catcher by banning a base runner from running into the catcher while trying to score? Some people are proposing that the base runner be required to slide.

This discussion, at least around San Francisco, is prompted by the Giants star catcher, Buster Posey, reportedly being out for the season because of a broken ankle or leg bone suffered when the runner ran into him at home plate. One of the commentators who was calling the game on TV is a former Giants pitcher. He said the hit was clean based on the current rules. It didn't look out of the ordinary to me. It's just that in this case Posey's leg got twisted around and he broke a bone.

Various rules in various sports have been changed over the years with an eye towards preventing injuries. Should this rule be changed, or is it an acceptable risk resulting from physical contact in a sport?