A prediction.... 
From Helm's Deep in the Two Towers
By Théoden

‘The world changes, and all that once was strong now proves unsure. How shall any tower withstand such numbers and such reckless hate?’
I feel uncomfortable in saying anything on JRRT's expression.... but this was only written in the aftermath of WWII, and he served on the Western Front in WWI. I guess he was able to see changes (both physical and societal) as well as anyone.