There is slim chance of reversing this, but hunting doesn’t actually begin for months.  There are better solutions than the thoughtless slaughter of so many animals.  Here is the language they use to address opposition;

“I am opposed to the live capture and or lethal removal activities. How do I express my opposition?

During the EA public scoping process, individuals and organizations had the opportunity to provide formal comment to Grand Canyon National Park. Once the EA and FONSI were completed and signed the opportunity to provide formal comment is no longer available.

Individuals or groups who wish to express their opposition/concern may do so as part of the rights protected and guaranteed by the First Amendment. Those wishing to exercise their First Amendment rights should review the park website for information about permits.”