This will winnow the chaff from the wheat. The churches that cave-in are the ones in it for the money instead of serving the Lord.
And losing the tax exempt status is a one-time weapon. Thereafter, the churches are free to openly campaign for candidates and issues as they see fit with no further fears about losing tax exempt status.
This is definitely a two-edged sword. Liberals may want to do this very sparingly. While we're on the subject, what about black churches? Equal application of the law, anyone?