I wouldn't write it off yet. The popularity of protestantism is very prone to wax and wane with the times. A really charismatic preacher or two can make a big impact. Most of the mainlines we see in the US today started from just itinerant preachers and camp meetings. Personally, I think that's because the emphasis on "personal relationships" with God lends itself to more of a "social contagion" model of popularity, as people seek to imitate friends and neighbors who share spiritual experiences. That's not a negative thing necessarily. But they can't lean on tradition like the Orthodox or Catholics do.