Yes, destroying the sword could symbolize Parson's desire to change. He wants to shake free from the bondage Erfworld has placed on him.

However, he also just destroyed a powerful tool that could help him bring peace to both Erfworld and himself.

The sword only nudges foward things you already want to do. Parson would have been better served by focusing his attention inward. It can't nudge foward what isn't there.