Broccoli nearly demolished by cabbage worms. Should I rip them up and replace them?

Hi, I have a small raised bed with a couple of broccoli plants. They've grown tall and proud but have no head yet. In the past couple of days, they've been eaten up quickly much to my disappointment. Space in my garden is very limited and I'm tempted to rip them out and replace them with a new plant before it's too late. Is this a good plan? What is a good replacement candidate if I do? Zone 7b, NYC.