Just come across this excellent article on Alpinist.com, featuring a translation of Oscar Eckenstein's 1908 article on the future of ice climbing. I read this years ago (and it inspired my book in many ways) but had forgotten how visionary Eckenstein was for his era.
"What the ice climbers of the future will be able to climb, I know not. But I find it hard to believe that we have already reached the limits of what is possible."
http://www.alpinist.com/doc/web12f/wfeature-eckenstein#