I knew we were close, but wow...
The technology is definitely here, but the question is when it will be available to the general public. This is one of the only pieces I've ever heard where I can actually completely forget that it's not real, and that it was done on a computer. This is, so to speak, an "Avatar" moment of music (if you've seen the movie, you'll know what I mean, if not, it's pretty much the moment of "holy crap this is amazing" where you have to stop to remind your self it's not real).
To top it all off, it's a very nice track as well, and very enjoyable to listen too. I would say this is the best I've ever heard from samples/midi. If you think that a real orchestra will never be able to be accurately replicated, listen to this, and prepare to have your mind blown.