It's an unfortunate situation for sure. But the WBC will always be in the spring. It's in the perfect place after the Super Bowl and before the MLB regular season when people who are baseball fans are craving baseball content. They'll never move it to being in season because that would be terrible. Moving it to the end of the season would basically ensure that 0 pro pitchers ever show up since all their arms would be dead tired by then and they'd be risking all kinds of additional arm injuries depending on when they had shut down.
This isn't even a repetitive motion injury, it's a total freak accident that cannot be prevented. s*** happens.