I probably should have read the whole article, but I could not help thinking that the services sounded like a rock concert, and if it's free to the public, of course the church will fill up.
Religion is more than filling up the pews on Sunday. Since Presbyterians claim to be Christian, it also has to fill up the soul with the love of Jesus and the gifts of the Holy Spirit.
Might have to do as well with the Presbyterian take on homosexuality, abortion, other 'tradition-defying' tenets of the faith.