Pardon if I am a little leary of underestimating our seperated brethren, as they have proven extraordinarily resilient over the centuries.
Protestantism is undergoing a severe challenge today, I do not dispute that. However, I have my reservations about extrapulating that, to full blown extinction (or anything near that). Seems like they’ve undergone a few such depressions, then bounced back (can you say ‘revival’?).
What’s more, I’m not so sure it’s a bad thing. Protestanism is…not good. But protestants, are. They are generally pretty darn good folks. Certainly better than pretty much any other group outside of Catholics (in my humble, and of course completely objective, and unbiased opinion

) What’s more, in my experience, stateside anyway, seems like when the economy is in the tank, our Catholic Churches swell in attendence–ppl. feeling pain, come back to her friendly confines, for comfort, renourshiment, rest, replenishment, etc.–but when times are good…our Churches get back burnered. We are somewhat forgotten, as folks are lured away by…well…more alluring endeavors. Amassing things to come back to confession for, among others…
Hence what I see, is the Catholic Church in the US enjoying a little bit of a bump, compliments of a brutal recession, whose effects continue to linger.
Just the opposite is true of our protestant counterparts. When the economy is good and booming…their pews swell up. I do not know why that is (perhaps because I’m not protestant); but I do believe, from my own personal experience, that when the economy is humming along, their churches swell up nicely.
So, where do I see protestantism in 15-20 years?
I’d say, about where I see the economy.
What does that mean? Who knows. Looking back at history, and projecting forward, I’d say their prospects (and ours, economically) are pretty good. However, looking at 16 TRILLION dollars of national debt, and continuing to go up, with no end in sight…seeing our GDP stagnate…watching our job market evaporate…watching our middle class being disseminated, and giving ever more way to government dependence…let’s just say I don’t like what I’m seeing.
Now, our country has proven pretty resilient–but we’ve got some serious issues facing us.
But the bottom line, as I see it–as goes the nation’s economy…so goes protestantism.
…and I’m no economist.
Just my humble (and admittedly anecdotal), take.