The unification of the West into one (American-led) hegemony, as we foresee, will no doubt have linguistic consequences. Besides the influx of lots of foreign vocabulary, periods of hegemonic consolidation tend to involve deliberate standardisations (think of an equivalent to the Académie française). And then there's the issue of deliberate evocations of traditional forms. At least the "upper class" speech and writing may be expected to deliberately evoke classicism.