A specific version of the Christian message brings people to church in economic downturn

An article I read (found here) speaks of Evangelical churches growing in attendance numbers in Sunday worship during times of economic downturns while mainline churches attendance continues to fall (albeit a bit slower than in "normal" times).

The study was done by a professor at Texas University and tracks some of the historical trends of economic downturns and church attendance.

Of the many questions I have one that I continue to come back to is:

Is there anything the mainline church can do to stop the dramatic decline of members?