Wieters, however, wanted to make it clear that this isn't a rule merely designed to protect catchers.
"You know, catchers don't want to see runners getting hurt, either," he said. "So you want to be able to protect the runner, too. And I think that's part of the issue of why it's taken so long to put something together. You've got to be able to protect both parties. You can't just say, 'The catcher can do whatever he wants, so now you're going to have a bunch of runners getting hurt.' It's a fine line of trying to keep the game the same but at the same time coming up with a rule that also eliminates some injuries."
And he and Showalter both believe baseball accomplished that Monday.
"You're probably not going to see, with the naked eye, a lot of the changes," Showalter said. "Just hopefully, we won't be showing on 'Baseball Tonight' these violent collisions that shouldn't have happened."
ESPN.com's Jerry Crasnick and Jayson Stark, ESPNDallas.com's Richard Durrett, ESPN The Magazine's Buster Olney and The Associated Press contributed to this report.