During the summer, we had ivy growing out a couple of our boxwoods. We thought it was poison ivy, so we decided to spray it with brushbegone. Bad idea! It killed one side of the shrub. Is it permanently dead or can it be revived?

We were thinking about pulling them out anyway because there's one that looks like the roots are pushing our walkway up, creating cracks. But if we do this, I'm afraid our whole walkway might be pulled up with the shrubs. What a major task this will be!

Input appreciated!