Death of Language - The Real way Cultures Decay and Die? I think that apogee of western civilization was in 19th century. And now we observing steadily decline. Why? Because we moved production to East, thinking 'they will produce goods for us'. Comfortable, don't you think?
Moreover we don't have ambitious goals. Only consuming... That's new religion, alas! When you consume so much you don't have time for creative activity. Similiar proceses happened in the past, that's true. Rise, apogee, decline.
It's important to have relatively equal competitors, like in medieval Europe, ancient Greece, Apennine Peninsula (8th to 3th century BC). If we have much stronger opponents then we probably will be conquered.
Language maybe will surive but civilization may collapse. When summerian civilization was only history, in Mesopotamia their language still existed 2000 years after! (higher culture). Civilizations falls but languages have chances to survive. We know ancient greek language but this civilization gone for good.