It depends what you mean by 3D video, but now that facebook has put 2 billion dollars into Oculus Rift, and other tech companies like Sony are talking about similar kind of VR devices, I expect we're going to see a significant amount of money invested in them over the next few years from several major tech companies, and we're probably going to see some high-quality consumer devices appear. How popular they will be, of course, is anyone's guess, but I think the odds are good.

I don't think that negates your main point, though; text is still the dominant medium of the internet, and will probably continue to be so. Another big advance in text in recent years is Google Translate; the fact that someone can post an news article in Russian on reddit and I can read it easily without any extra effort on my part is a huge advance.