I'm in agreement with your idea of mass exodus. If that occured, Christianity would be restored to its' rightful place as the foundation of our nations' culture since Christians are the majority religion in America. The other religious groups would still be free to worship as they please, but the cultural suicide now being forced upon America via multiculturalists would be ended.
When I lived on Okinawa, we Americans were free to celebrate our holidays. But there was never any question that Okinawan festivals were for the celebration of their religious holy days and not for ours as well. And that's the way it should be.
If the news (at least here in California) that schools do, and keep doing, things like taking students off campus for medical services (read birth control, abortions, etc.) without the knowledge or consent of their parents didn't cause more than a day's worth of news, then this won't bother most people, unfortunately.
Thank goodness I homeschool and have to deal with precisely 0% of this garbage.