Most wild herbivores eat Grass, and flora that doesn't require pollination
You'd be surprised how many things can survive without bees.
I dare say, there's be almost no herbivorous species go extinct. Yes, while some herbivores do eat flowers and such, I've never heard of an animal that lived exclusively on plants that require pollination, and thus, I don't think any herbivore species will go extinct.
Sure, we'll lose some flowers, maybe even a species of tree or two, even the majority of some plant populations, but for the most part, we'd be fine.