I can't speak for what the OP meant, but at least out West cattle fill a critical role in the wilderness ecosystem vacated by bison. If you remove the cattle, you would need to find a suitable replacement with similar grazing patterns.

As a well known example, pronghorn antelope benefit significantly from coexisting with cattle/bison populations, due to reduced predation and increased food supply (they have complementary feeding patterns). Grazers create ideal habitat for pronghorn, so pronghorn populations tend to track grazer populations. These days, that is cattle.