[strawhatguy]

I actually wonder about his conclusion that 50 years hence English will be unrecognizable.

There will be changes of course. Yet we are also more connected than ever, whereas the next town over would be a whole day trip in the past. The separation allows for more divergence.

Well, maybe if we get to Mars, differences might crop up again.

[ksenzee]

This isn't how I read his conclusion. He's saying English will be different in fifty years, but he's not saying it'll be unrecognizable. Look how little difference there is between the 1900 passage and the 2000 passage.