I know with a church I am familiar with, it wasn't the music. It is the family values they preached, but never practiced, They played favorites and spent money recklessly on "staff trips", but ignored family. Now the church is less then half it's size. Has an amazing godly pastor. But people are leaving I believe primarily due to discouragement.
I pray this church survives. I love the people there. But I know it is scary situation for many sweet loving members.
Their music is still Godly, they teach and preach KJV, actively soul win. The only thing I see is family issues.